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HOMIBHABHA CHEMISTRY

HOMIBHABHA CHEMISTRY

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HOMIBHABHA CHEMISTRY

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  1. 9. The electronic energy levels in Bohr’s atomic model are called- (A) ground states (C) orbits STRUCTURE OF ATOM AND CHEMICAL BONDING 10. (B) orbitals (D) Rydberg levels 1. Which of the following electronic transitions in a hydrogen atom will require the largest amount of energy? (A) From n=1 to n=2 (B) From n=2 to n=3 (C) From n= to n=1 The valency of an element ‘X’ is 3 and that or ‘Y’ is 2. The combination XY would be- (A) Aluminium sulphate (B) Aluminium nitrate (C) Aluminium phosphate (D) Aluminium oxide 2. 11. Study the given figure. When an electron jumps from L level to M level, there occurs- (A) emission of energy (B) absorption of energy (C) emission of g-radiation (D) emission of X-rays 12. The nucleus consists of – (A) protons (C) electrons (B)neutrons (D)nucleons ……….. tavourable conditions for electrovalency are- (A) low charge on ions, large cation and small anion. (B) high charge on ions, small cation and large anion (C) high charge on ions, large cation and small anion (D) low charge on ions, small cation and large anion 3. Which of the following statements is incorrect? (A) The charges on an electron and a proton are equal and opposite. (B) Neutrons have not get charge. (C) Electrons and protons have the same mass (D) The mass of proton and a neutron and nearly the same. 13. A bond with maximum covalent character between non-metallic elements is found- (A) between atoms of same size (B) between chemically similar atoms (C) between identical atoms (D) between atoms of widely differing electronegativities 4. The ratio of the volume of an atom and the volume of a nucleus is- (A) 1010 (C) 1015 (B) 1O12 (D) 1020 5. 6. The species having more electrons that neutrons is - (A) F (C) O2- 14. (B) Na+ (D) Mg2+ When sodium chloride is dissolved in water, the sodium ion gets- (A) oxidised (C) hydrolysed 15. (B) reduced (C) hydrated Mass number of an element is 2Z+6, where Z is the number of electrons. Number of neutrons will be- (A) 2Z+6 (C) Z+8 7. (B) Z+6 (D) Z+2 Which one of the following bonds will be the most polar? (A) N-Cl (C) C-F 16. (B) O-F (D) N-N The introduction of a neutron into the nuclear composition of an atom would lead to change in- (A) the number of electrons. (B) the chemical natural of atom (C) its atomic number (D) its atomic weight 8. a-particle Rutherford eventually led to the conclusion that- (A) mass and energy are related (B) electrons occupy space around the nucleus (C) neutrons are buried deep in the nucleus (D) the point of impact with matter can be precisely determined scattering experiment Which of the following is iso-electronic with neon? (A) O2- (C) Mg (B) S2- (D) Na 1

  2. 17. The electronegativity of O,F,N, Cl and H are 3.5, 4.0, 3.2 and 2.1 respectively. The strongest bond will be - (A) F-O (C) N-H (r) In polar covalent molecules, the shard electrons spend more time on the average near one of the atoms. Instructions: (B) O-Cl (D) O-H 21. Two atoms A and B are represented by their mass number and atomic number as- (NTSE State-II/2007) The questions from 18 to 20 consist of an Assertion (a) and Reason (r). Use the following key to choose the correct answer- (A) If both (a) and (r) are correct and(r) is the correct explanation of (a). (B) If both (a) and (r) are correct ant (r) is not the correct explanation of (a). (C) If (a) is correct but (r) in incorrect (D) If (a) is incorrect but (r) in correct (a) In Rutherford gold foil experiment, very few a- particles are deflected back. (r) Nucleus present inside the atom is heavy. 19 A and 21 B 9 9 Read the following statements: (A) A and B belong to the same element (B) A and B have the same number of protons (C) A and B are isotopes (D) A and B are isobars (E) A and B have the same number of neutrons Which one of the following group of statements in correct? (A) c,e,d (C) b,c,a 18. (B) a,b,d (D) e,ab 19. 22. (a) Ionic compounds tend to be non-volatile. (r) Inter molecular forces in these compounds are weak. Mass number of oxygen is - (A) 8 (C) 20 (B) 16 (D) 32 20. (a) The atoms in a covalent molecule are said to share electrons, yet some are polar. v vv vv vv v 2

  3. ACIDS, BASES AND SALTS 1. Match the following (i) Grapes (ii) Vinegar (iii) Lemon (iv) Sour milk (A) (i)-(C), (ii)-(A), (iii)-(D), (iv)-(B) (B) (i)-(B), (ii)-(A), (iii)-(D), (iv)-(C) (C) (i)-(D), (ii)-(A), (iii)-(B), (iv)-(C) (D) (i)-(B), (ii)-(C), (iii)-(D), (iv)-(A) 8. (A) Acetric acid (B) Lactic acid (C) Tartaric acid (D) Citric acid The strength of the acid depends on the- (A) number of hydrogen atoms present in the molecule. (B) oxygen content. (C) density (D) concentration of hydrogen ions furnished by ionisation. 9. 2. …………….. is known as ascorbic acid which is present in citrus fruits. (A) Vitamin D (C) Vitamin A Which of the following acid is used in the manufacture of explosives like TNT (trinitron toluene). (A) CH3COOH (C) HCl (B) Vitamin C (D) Vitamin K (B) HNO3 (D) D3PO4 10. Which is a base and not an alkali? (A) NaOH (B) Fe(OH)3 3. (B) KOH (D) none is true Aqua-regia dissolves noble metals by producing- (A) Cl2 (C) NOCl (B) N2 (D) NCl3 11. Which of the following metals can displace hydrogen from the aqueous solution of sodium hydroxide? (A) Mg (C) Al 4. 10 mL of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralize will be – (A) 4 mL (C) 12 ML (B) Cu (D) Ag 12. Which of the following is a conjugate acid-base pair? (A) H3O+ & OH- (C) H+ & OH- (B) 8 mL (D) 16 mL (B) H2CO3 & HCO3- (D) NH4+ & NH2- 5. Match the following- (i) Hydrochloric acid (ii) Phosphoric acid (iii) Citric acid (iv) Acetic acid 13. (a) Organic acid (b) Strong acid (c) Vinegar (d) Weak acid CO2 reacts with _______ to form Na2CO3. (A) H2O (C) NaCl (B) NaOH (D) Na2O 14. The solution of a substance is water is slippery. It combines with an acid to produce a salt. The substance is- (A) an acid (C) a base (A) (B) (C) (D) (i) a, b, a, d, (ii) c, d, d, b, (iii) b, a, b, a, (iv) d c c c (B) a salt (D) none of these 15. 6. Fear and excitement generally cause one to breathe rapidly and it results in the decrease of carbon dioxide in the blood. In what way will it change the pH of the blood? (A) pH will decrease (C) no change Aqueous solution of CH3COOH contains: (A) CH3COO-, H+ (B) CH3COO-, H2O, CH3COOH (C) CH3COO-, H3O+, H+ (D) CH3COOH, CH3COO-, H+ (B) pH will increase (D) pH will adjust to 7 7. 16. When a strong acid is slowly added to water- (A) it releases heat (B) it absorbs heat (C) there is no heat change (D) none When a drop of phenolphthalein is introduced in lime water, the solution turns- (A) blue (C) red (B) milky (D) pink 3

  4. 17. An indicator that urns reddish brown when dissolved in soap solution is- (A) litmus (C) turmeric powder Natural indicator litmus is extracted from- 23. (B) china rose (D) None of these Examine the following statements 18. (a) Temporary hardness of water is due to the presence of soluble bicarbonates of (A) lichens (C) ants (B) earthworm (D) algae calcium and magnesium. (NTSE-Stage-II/2008) 19. Which of the following indicators is (b) Permanent hardness of water is caused by the presence of the chlorides and colourless in acidic medium? (A) Methyl orange sulphates of calcium and magnesium. (c) Rain water is the purest form of water (B) Turmeric powder (C) Litmus collected after a heavy shower. (d) Ion exchange of permutit process is the (D) Phenolphthalein modern and most effective method of removing both temporary and permanent 20. Which of the following is not an indicator? (A) Methyl orange (B) Litmus hardness of water. Which statements are correct? (C) China rose (D) Sunflower (A) (a) and (c) (B) (b) and (d) 21. Which of the following compounds is a base? (C) (a), (b) and (c) (D) (a), (b), (c) and (d) (NTSE-Stage-I/Raj/2007) (A) Salt 24. (B) Hydrochloric acid (C) Copper sulphate Some substances are given below- (NTSE-Stage-II/2008) (D) Sodium hydroxide (a) magnesium oxide (b) carbon dioxide (c) sulphur dioxide Which of the above substances, when (d) calcium oxide 22. Which one of the following acids has two replaceable hydrogen atoms? dissolved in water, turn blue litmus to red? Select the correct alternative. (NTSE-Stage-II/2008) (B) Acetic acid (A) Formic acid (A) (a) and (b) (C) (b) and (d) (B) (b) and (c) (D) (a) and (d) (C) Sulphuric acid (D) Phosphoric acid 4

  5. METALS AND NON-METALS 1. Rusting of iron can be prevented by (A) alloying (C) galvaning 2. Which of the following is a good conductor of heat and electricity? (A) graphite (C) chlorine 3. Metals are- (A) malleable (C) none 4. Metals can be obtained economically from (A) minerals (C) earth’s crust 5. Which of the following have low melting and boiling points? (A) phosphorus (C) iron 6. Which of the following metals catch fire on reaction with water? (A) sodium (C)magnesium 7. A metal, which forms a protective layer of its oxide on reactin with water, on its surface is- (A) sodium (C) potassium 8. Reactivity series gives- (A) arrangement of metals in the order of decreasing reactivity. (B) arrangement of non-metals in the order of decreasing reactivity (C) arrangement of metals in the order of increasing reactivity (D) arrangement of non-metals in the order of increasing reactivity 9. Metals like gold, platinum which do not easily react are called- (A) active metals (B) dull metals (C) noble metals Dd) bright metals 10. When MgO is dissolved in water, Mg(OH)2 is obtained. A rd litmus paper dipped in this solution turns blue, this shows that the solution is ________ in nature. (A) acidic (C) alkaline (B) neutral (D) reactive (B) painting (D) all of these 11. Calgon is a substance which is used to remove the hardness of water. The formula of calgon is- (A) ( ) [ 6 3 4 2 (PO Na Na O Si Al Na ( ) SO NH FeSO 4 2 4 4 6 . . O H O S Na 2 3 2 2 5 . ] (B) (B) oxygen (D) nitrogen 2 2 2 8 H O (C) 2 (D) (B) ductile (D) both 12. Type metal is an alloy of- (A) Pb and Sn (C) Cu and Zn (B) Pb, Sn and Sb (D) Cu, Sn and Sb (B) ores (D) none B Lightest liquid metal is- (A) Hg (C) Ga (B) Cs (D) none of these 14. (B) sodium (D) (a) and (b) 90% of sun’s mass it- (A) He (C) O2 (B) H2 (D) Ar 15. Carnallite (KCl.MgCl2.6H2O) is an ore of- (A) chlorine (C) astatine (B) potassium (D) (a) and (b) (B) iodine (D) bromine 16. Magnetite is an oxide of metal X. The metal is- (A) Mn (C) Fe (B) aluminium (D) magnesium (B) Mg (D) Cu 17. Hoope’s process is used for the purification of- (A) Cu (C) Al (B) Fe (D) At 18. Mercury is also called- (A) liquid gold (C) liquid silver (B) liquid copper (D) none of these 19. Nitric acid can be prepared by which of the following method? (A) Birkeland –eyde process (B) Ostwald process (C) Contact process (D) (a) & (b) both Which of the following is/are used as bleaching agent? (A) SO2 (C) Cl2 20. (B) H2S (D) all 5

  6. 21. Which of the following element is not found is free state in the nature? (NTSE-Stage-I/Raj/2007) (A) Silver (C) Sodium (A) NaHCO3 and CO (B) CaCO3 and CO (C) Na2CO3 and CO2 (D)NaHCO3 and CO2 (B) Copper (D) Gold 27. 22. Which of the following non-metal is found is liquid state at room temperature? (NTSE-Stage-I/Raj/2008) (A) Sulphur (C) Iodine When agma cools below the surface of the earth, the granite is formed which is used in buildings. It mainly consists of- (B) Carbon (D) Bromine (NTSE-Stage-II/2007) (A) quartz and haematite (B) quartz and felspar (C) bauxite and calcamine (D) felspar and silver glance 28. Match the following- (A) CH4 (i) Neither combustible nor supports combustion (ii) Combustible (iii) Supports combustion (iv) Extinguishes fire 23. (B) CO2 (C) N2 (D) O= Which of the following indicates the correct matching? Minerals characteristics (NTSE-Stage-I/Raj/2007) (A) They occur naturally (B) They have characteristics chemical composition (C) They do not have specific chemical properties (D) They do not have a specific chemical composition. generally have the following (NTSE-Stage-II/2008) (A) a,(i); b,(ii); c(iii); d,(iv) (B) a,(ii); b,(iv), c(i); d,(iii) (C) a,(ii); b,(iii); c(i); d,(iv) (D) a,(iii); b,(iv); c(ii); d,(i) Which of the following statements are correct? (A) a and b (C) c and d (B) a, c and d (D) a and d 29. Which of the following displacement reactions is possible? 24. The percentage of gold present in 20 carat gold is- (NTSE-Stage-II/2009) ¾® ¾ (NTSE-Stage-II/2008) (B) 100 (D) 73.3 (A) Copper + Sodium chloride (A) 83.33 (C) 50 Copper chloride + Sodium ¾® ¾ (B) Lead + Potassium nitrate 25. Lead nitrate + Potassium ¾® ¾ Which of the following elements is non-metal? (NTSE-Stage-I/Raj/2007) (A) Na (C) Cu (C) lron + Lead nitrate (B) Fe (D) S lron nitrate+ Lead ¾® ¾ (D) Silver + Copper nitrate 26. Silver nitrate + Copper When a compound A is heated, a gas B is evolved which turns lime water milky. Compound A is used in the manufacture of glass. Gas B has a property of extinguishing fire and it does not support animal life. The compound A and B are respectively. (NTSE-Stage-II/2007) 6

  7. The carbon obtained in this reaction is: (A) animal charcoal (C) coke In diamond, the bonding between carbon atom is- (A) co-ordinate (C) electrostatic CARBON 1. (B) sugar charcoal (D) wood charcoal 11. The allotropic form of carbon, which is used as printers link is- (A) charcoal (C) carbon black (B) ionic (D) covalent (B) gas carbon (D) coke 12. The general formula of alkyne is- (A) CnH2n+2 (C) CnH2n-2 2. (B) CnH2n (D) CnH2n-n Which one of the following substances does not contain carbon? (A) sugar (C) wood 13. (B) limestone (D) sand The general formula for saturated hydrocarbon is- (A) CnH2n+2 (C) CnH2n-2 (B) CnH2n (D) CnH2n-n 3. Which one is purest form of carbon? (A) wood charcoal (C) graphite 14. (B) anthracite (D) soot Compounds made up of carbon and hydrogen only are called- (A) alkanes only (C) alkynes only 4. (B) alkenes only (D) hydrocarbons When solid carbon dioxide is allowed to evaporate rapidly it change into- (A) carbon dioxide gas (B) carbon monoxide (C) a snowy mass (D) dense white fumes 15. The compound having a double bond is- (A) C3H6 (C) CH4 (B) C3H8 (D) C2H6 16. 5. In the reaction CH3COONa+NaOH CaO ¾ ¾® ¾ Which of the following can absorb colouring matter? (A) Coke (C) Lamp black X + Na2CO3 product ‘X’ would be - Heat (B) Animal charcoal (D) None of these 17. Final products of the oxidation of hydrocarbon is- (A) acid (C) dihydric alcohol 6. (B) aldehyde (D) none of these Which form of carbon is used to increase the durability of tyres? (A) Coke (C) Lamp black 18. (B) Paraffin oil (D) Coaltar Ethyne is isoelectronic with- (A) chlorine (C) nitrogen (B) oxygen (D) CO2 7. Which of the following substances are crystalline allotropes of carbon? (i) Diamond (iii) Graphite (v) Coal (vi) Fullerene (A) (i) to (vi) all (C) (i), (iii) & (vi) 19. Which of the following is used to make aerated drink? (a) carbon dioxide (b) nitrogen (c) air (d) none of these (ii) Charcoal (iv) Lamp black (B) (i), (ii) & (iv) (D) (iv), (ii), (v) 8. Which of the following substances is a good conductor of electricity? (A) Diamond (C) Charcoal (B) Graphite (D) Coal 9. Hardest substance is- (A) graphite (C) diamond (B) silica (D) fullerene ¾ Con ¾ H ¾ SO ¾ ® + . C H O 12 C 11 H O 10. 2 4 12 22 11 2 7

  8. + ¾® ¾ N 3 H X 20. 2 2 X is (A) N2H4 (C) NH3 (B) N3H (D) NH2OH 21. The cooking gas is mainly a mixture of following two gases- (NTSE-Stage-I/Raj/2007) (A) Methane and Ethane (B) Ethane and propane (C) Propane and butane (D) butane and pentane 22. Graphite is used as a lubricant because- (NTSE-Stage-I/Raj/2007) (A) It is conductor of electricity (B) It is non-combustible (C) It is soluble in organic solvent (D) It’s layers can slide one over the other 23. Now a days many to the automobiles are using CNG (Compressed Natural Gas) to minimize pollution. The CNG is mainly. (NTSE-Stage-I/Raj/2007) (A) methane (C) nitrogen (B) butane (D) hydrogen 24. Which of the following forms of carbon is not a crystalline one? (NTSE-Stage-I/Raj/2008) (A) diamond (C) graphite (B) charcoal (D) fullerene 25. Graphite is used as a lubricant in machines because it has a very high melting point and also it- (A) is crystalline (B) has layer structure (C) is a giant molecule (D) is a liquid at room temperature 8

  9. NATURAL & ARTIFICIAL RESOURCES 1. Natural of nitrogen towards litmus is- (A) acidic (C) neutral 2. Which statement is not true about nitrogen? (A) It is insoluble in water (B) It is a colourless gas. (C) It is poisonous in nature (D) It is as heavy as air. 3. Which of the following is used in making artificial smoke and clouds on stges? (A) Liquid oxygen (B) Liquid hydrogen (C) Liquid carbon dioxide (D) Liquid nitrogen 4. When a burning splinter is taken in a gas jar filled with nitrogen then- (A) it burns more fast (B) it is extinguished (C) it burns with explosion (D) it is not affected 5. Which of the following is formed when metals react with nitrogen? (A) Nitrates (B) Nitrides 6. Space crafts or rockets going into space must carry- (A) liquid oxygen (B) liquid hydrogen (C) liquid nitrogen (D) liquid carbon dioxide 7. The formula of rust is- (A) Fe2O3.×H2O (C) FeO.×H2O 8. The formula of oxygen in air is- 1 (C) catalytic mixture (D) nitrogen mixture 10. In what direction doe the buoyant force by liquid acts on an object? (A) Vertically upward (C) Both (A) and (B) (B) basic (D) none (B) Vertically downward (D) None of these 11. A body will sink in a liquid when- (A) the weight of the body in air is equal to the upthrust. (B) the weight of the body in air is less than the upthrust. (C) the weight of the body in air is greater then the upthrust. (D) None of these 12. Loss of weight of a body immersed in a liquid is- (A) equal to the weight of liquid displaced. (B) more than the weight of liquid displaced (C) less than the weight of liquid displaced (D) zero 13. In foam type fire extinguisher, which of the following products are formed when the following equation occurs? ( ) 6 3 4 2 + NaHCO SO Al ( ) 2 3 6 3 O H OH Al + ( ) 3 6 2 CO OH Al + + ( ) 2 3 6 3 O OH Al + + ( ) 2 3 6 2 CO OH Al + ¾® ¾ 2 Na 3 Na 2 Na 3 + ? SO SO SO SO Na 3 + (A) 2 4 (B) Nitrites (D) None of these (B) 2 4 (C) 2 4 (D) 2 4 14. Which component of air is used in fire extinguishers? (A) Oxygen (C) Carbon dioxide (B) Nitrogen (D) None of these 15. (B) Fe2O3 (D) None Water cannot be used to extinguish oil fires because- (A) it is a poor conductor of electricity. (B) it is lighter than oil. (C) it is heavier than oil (D) it’s B.P. is high th of the volume (A) 4 1 16. th of the volume (B) Sodium bicarbonate is used in fire extinguisher because it produces- (A) carbon dioxide gas (C) foam 6 1 NTSE-Satge-I/Raj/2007) (B) water (D) sodium oxide th of the volume (C) 5 1 17. Which of the following compounds does not produce oxygen? (NTSE-Satge-I/2008) (a) Potassium paramagnet (b) Potassium chlorate (c) Water (d) Salt th of the volume (D) 3 9. A mixture has four parts of potassium chlorate and one part of manganese dioxide. The mixture so formed is called- (A) manganese mixture (B) oxygen mixture 9

  10. PHYSICAL & CHEMICAL REACTIONS 1. Critical temperature is temperature- (A) at which a liquid can solidified (B) above which a gas can be liquefied. (C) above which a gas cannot be liquefied (D) none of these 2. ( ) . 3 Nacl aq AgNO + Energy (D) None Which of the following is an exothermic reaction? (A) 3 CaO CaCO ¾® ¾D SO O SO ® + 2NO PCl ® 2NO O N ® 8. + CO 2 (B) 2 2 3 (C) 5 2 (D) 2 4 2 ( ) ( ) s ( ) . 9. ¾® ¾ + aq . AgCl NaNO aq 3 Double displacement reaction is- (A) H CuO 2 + 3 2 Cl P ® + CuSO BaCl + 2 KNO ® Above reaction is a- (A) precipitation reaction (B) double displacement reaction (C) combination reaction (D) (a) and (b) both ® + Cu 2 PCl H O 2 (B) 2 3 ® + BaSO O + CuCl (C) 2 4 4 2 2 KNO 3. (D) 3 2 2 + ¾® ¾ + - CuO H H O CU , reaction is an example of 10. 2 2 (A) redox reaction (B) synthesis reaction (C) neutralisation (D) analysis reaction. The reaction in which substance is decomposed on heating to give its onsituent element is called- (A) combination reaction (B) decomposition reaction (C) displacement reaction (D) None of these 4. Rusting of iron is a chemical reaction. The reaction can be termed as- (A) displacement (B) combination (C) double decomposition (D) decomposition 11. A mixture of alcohol and water can be separated by- (A) separating funnel (B) fractional distillation (C) simple distillation (D) crystallization 5. Which of the following reactions depicts the neutralization reaction? 2 ZnCl HCl Zn ¾® ¾ + O H MgO ¾® ¾ + ¾® ¾ + NaOH HCl ¾® ¾ + 12. Boiling point of a substance- (A) decreases with decreasing the pressure (B) decreases with increasing the pressure (C) increases with decreasing the pressure (D) All of these + OH H (A) 2 ( 2 )2 Mg (B) 2 O CO H H CO 3 (C) 2 2 2 NaCl 13. + HO (D) The temperature at which a liquid starts converting into solid without any rise in temperature is called- (A) melting point (C) freezing point 2 6. Redox reactions are those where ____________ occur simultaneously. (A) exothermic-endothermic reactions occur (B) oxidation-reduction (C) reversible-irreversible reactions (D) composition-decomposition reactions (B) boiling point (D) None of these 14. Freezing point of water is- (A) 100oC (C) 273.15K (B) OoC (D) (b) and (c) both 7. 15. Which of the following is an endothermic reaction? (A) N2 (g) + 3H2 (g) 2NH3 + 22.4 Kcals. (B) N2 (g) + O2 (g) 2NO (g) – 180 Kcals The change of state of substance from gas to liquid is called- (A) melting (C) condensation (B) boiling (D) vaporization 16. Glycerol is purified by- (A) fractional distillation method (C) CO2 (g) + H2 (g) CO (g) + H2O(g) 10

  11. (B) steam distillation method (C) vaccum distillation method (D) simple distillation method 21. 17. Substance which has non-volatile impurity, is purified by- (A) simple distillation (B) crystallization (C) steam distillation (D) vaccum distillation Which of the following substance is not a compound? (NTSE-Stage/I/Raj/2007) (A) Water (C) Glucose (B) Air (D) Salt 22. Which of the following statements in false? (NTSE-Stage/II/2007) ( ) ( ) (A) Melting and freezing point of a substance are the same. (B) Vaporization of liquid takes place only at its boiling point (C) Pure water has no taste (D) Water allows sunlight to pass through it. + - + ¾® ¾ H aq OH aq H O 18. 2 above reaction is an example of- (A) neutralisation (B) addition (C) combination (D) electrolysis 23. 19. Some matter and their group are given in column P and Q respectively. (NTSE-Stage/I/Raj/2008) (P) (a) Air (b) O2 (c) Copper sulphate (d) Sodium hydroxide The correct option is- (A) a (ii), b(iv), c(i), d(iii) (B) a(iv), b(iii), c(ii), d(i) (C) A(i), b(ii), c(iii), d(iv) (D) a(ii), b(i), c(iv), d(iii) Purity of oxalic acid can be determined by- (A) deterring the boiling point (B) deterring the method point (C) by dissolving it into water (D) None of these (Q) (i) Element (ii) Mixture (iii) Base (iv) Salt 20. It water begins to boils at 15oC it shows that pressure it- (A) lower than the atmospheric pressure (B) greater than the atmospheric pressure (C) equal to the atmospheric pressure (D) None of these 11

  12. AIR & WATER 1. Air is a/an (A) element (C) mixture 2. The instrument used to measure atmospheric pressure is- (A) electrometer (C) barometer 3. Up higher in the mountains, water boils - (A) at 100oC (C) above 100oC 4. Photosynthesis by plant, releases - (A) CO (C) N2 13. Which gas dissolves in water in a small amount and is a source of respiration for water animals? (A) CO2 (C) N2 14. (B) O2 (D) H2 (B) compound (D) none of these Which one of the following gases is not found free in air? (A) Nitrogen (C) Carbon dioxide (B) thermometer (D) magnometer 15. 16. (B) Oxygen (C) Hydrogen (B) below 100oC (D) above 200oC Which of the following gases is heavier than air? (A) Nitrogen (C) Carbon monoxide (B) Oxygen (C) Hydrogen (B) CO2 (D) O2 In an experiment essential materials are test tube, glass tubes, lime water, ice cubes and shoot of hydrilla plant. In the experiment air is passed through lime water then lime water turns milky. It shows- (A) the presence of carbon dioxide in air. (B) the presence of water vapour in air. (C) that green plants give out oxygen. (D) that oxygen is lighter than air. 5. 6. 7. 8. 9. Hot air- (A) is heavier than cold air (B) weights the same as cold air (C) is lighter than cold air (D) None of the above 17. Dry air is free from - (A) oxygen (C) hydrogen (B) water vapour (D) sulphur dioxide Density of liquid mercury is - (A) 13.8 g/cm3 (C) 12.8 g/ cm3 (B) 13.6 g/cm3 (D) 12.6 g/cm3 At higher altitudes, mountaineers find it difficult t breathe because- (A) air is slightly heavier than oxygen (B) oxygen is slightly heavier than air (C) oxygen is slightly lighter than air (D) both (A) and (C) Clouds are present in - (A) troposphere (C) mesosphere 18. 19. (B) stratosphere (D) themosphere Which of the following layers is also known as ionosphere? (A) Troposphere (C) Mesosphere 10. (B) Stratosphere (D) Themosphere Global warming is caused when air has in excess: (A) oxygen (C) carbon-di-oxide (B) water (D) NO2 Which of the following component of air cannot be taken directly by plants? (A) Oxygen (C) Carbon dioxide 11. 12. (B) Nitrogen (D) None of these Which statement is wrong for physical properties of oxygen? (A) It is colourless gas. (B) It is tasteless gas (C) It is slightly lighter than air. (D) It is odourless gas. Which gas support to combustion? (A) CO2 (C) O2 The content of water vapour in air - (A) varies (B) does not vary (C) is more as we go up from earth’s surface (D) None of the above 20. Components of air can be separated by which technique? (A) Filteration (C) Fractional distillation (D) By separating funnel (B) H2 (D) N2 (B) Sublimation 12

  13. POLLUTION 1. Fluoride pollution mainly affects- (A) teeth (C) brain 2. In 1984, the Bhopal gas tragedy took place because methyl isocyanate- (A) reached with water (B) reached with DDT (C) reached with ammonia (D) reached with CO2 3. Maximum permissible limit of noise as per the noise pollution rules 2000 of India is- (A) 75 decibel (C) 55 decibel 4. Silicosis is caused by - (A) acid rain. (B) depletion of ozone (C) inhalation of aerosols. (D) inhalation of sulphur dioxide. 5. Sterility is caused by which pollutant in water? (A) Copper (C) Cadmium 6. The pH of acid rain water is- (A) 1.2 (C) 5 7. Byssinosis is a disease caused by - (A) fly ash (C) cotton fibres 8. Major source of methane in India is - (A) fruit orchards (B) sugarcane plantations (C) rice fields (D) wheat fields 9. Which element is believed to be responsible for the fall of the Roman Empire? (A) Copper (C) Arsenic 10. Supersonic jets cause pollution by thining of - (A) CO2 layer (C) O2 layer 11. Cracking or rubber is caused due to- (A) acid rain (C) smog 12. 13. Sulphur dioxide affects - (A) cell wall (B) brain (C) skin (D) membrane system (B) heart (D) kidney Ultraviolet radiations from sunlight causes a reaction that produces- (A) fluorides (C) sulphur dioxide 14. 15. 16. 17. 18. (B) carbon monoxide (D) ozone DDT is a – (A) greenhouse gas (B) degradable pollutant (C) non degradable pollutant (D) None of these (B)65 decibel (D) 50 decibel News paper contains a toxic material called - (A) cadmium (B) manganese (D) mercury (B) lead Most atmospheric pollutants do not rise above - (A) 6000 m (C) 60 km (B) 600 m (D) 6m (B) Mercury (D) Manganese Jet aeoplanes release the pollutant in air called - (A) smog (B) photochemical oxidants (C) aerosols (D) fly ash (B) 3.1 (D) 6 Non-ionising radiations with specific biological effects are - (A) UV radiations (C) gama rays Which of the following pollutants is not harmful to the lungs? (A) CO (C) CO2 (B) cement dust (D)lead particles 19. (B) beta rays (C) X-rays 20. (B)SO2 (D) NO2 Which of the following vbehicular is currently accepted as ecofrindely? (A) Diesel (C) LPG 21. (B) Petrol (D) CNG (B) Lead (D) Zinc Rama was asked to list cause of air pollution. She prepared the following list. (NTSE-Steps-1/ Raj/2007) (A) Burning of coal (B) Burning of liquefied petroleum gas. (C) Burning of compressed natural gas (D) Occurrence of ozone gas at low altitudes (B) SO2 layer (D) O3 layer (B) soot (D) All of these 13

  14. 22. 23. Choose the correct answer (A) a only (B) b and c only (C) a,b and d only (D) all of the above The correct mass percentage of hydrogen in water is (NTSE-Steps-1/ Raj/2007) (A) 11.11 (C) 33.33 (B) 22.22 (D) 66.66 Leather industry causes pollution because it discharge one or more of following- (NTSE-Steps-1/ Raj/2007) (A) Greasy water (B) sulfide waste (C) volatile organic compounds (D) chromium Choose the correct answer (A)a only (B)b and c only (C)a,b and d only (D)all the above 24. Carbon mono oxide is hazardous gas. Inhaling this gas which of the following is affected? (NTSE-Steps-1/ Raj/2008) (A) haemoglobin (C) cell membrane (B) plasma (D) plastids 14

  15. ANSWER KEY STRUCTURE OF ATOM AND CHEMICAL BONDING Q. A. Q. A. Q. A. 1 D 11 B 21 C 2 D 12 C 22 B 3 C 13 14 C 4 C 5 C 15 C 6 B 16 B 7 D 17 D 8 A 18 19 B 9 C 10 A 20 A D C ACIDS, BASES AND SALTS Q. A. Q. A. Q. A. 1 A 11 C 21 D 2 B 12 B 22 C 3 C 13 14 B 23 24 D 4 D 5 B 15 B 6 D 16 D 7 A 17 C 8 D 18 19 A 9 B 10 C 20 D C D B METALS AND NON - METALS 2 3 4 5 A D B D 12 13 14 15 B B B D 22 23 24 25 B B A D CARBON Q. A. Q. A. Q. A. 1 D 11 A 21 C 6 D 16 C 26 C 7 B 17 C 27 D 8 A 18 C 28 B 9 C 19 D 29 C 10 C 20 D Q. A. Q. A. Q. A. 1 C 11 D 21 C 2 D 12 C 22 D 3 D 13 A 23 A 4 D 14 D 24 B 5 B 15 A 25 B 6 C 16 C 7 C 17 D 8 B 18 C 9 C 19 A 10 B 20 C NATURAL & ARTIFICIAL RESOURCES Q. A. Q. A. 1 C 11 C 2 C 12 A 3 D 13 D 4 B 14 C 5 C 15 C 6 A 16 A 7 A 17 D 8 C 9 B 10 A PHYSICAL & CHEMICAL CHANGES Q. A. Q. A. Q. A. 1 C 11 B 21 B 2 D 12 A 22 B 3 A 13 C 23 D 4 B 14 D 5 D 15 16 C 6 B 7 B 17 A 8 B 18 A 9 C 19 B 10 B 20 B C 15

  16. AIR Q. A. Q. A. 1 C 11 A 2 C 12 C 3 B 13 B 4 D 14 D 5 C 15 B 6 B 16 A 7 B 17 B 8 A 18 19 C 9 D 10 B 20 C C POLLUTION Q. A. Q. A. Q. A. 1 A 11 C 21 A 2 A 12 D 22 A 3 A 13 D 23 D 4 C 14 C 24 A 5 D 15 B 6 B 16 B 7 C 17 C 8 C 18 A 9 B 19 C 10 D 20 D 16

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