2018 NEET Chemistry Solved Paper

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2. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. Multiple ChoiceQuestions Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below: BrO4- →1.82BrO3-→1.5 VHBrO→1.595Br2→1.0652VBr- Then the species undergoing disproportionationis BrO3- BrO4- HBrO Br2 Answer Which one of the following conditions will favour maximum formation of the product in the reaction, A2 (g) + B2(g)⇋ X2 (g)∆r H = -XkJ? Low temperature and high pressure Low temperature and low pressure High temperature and low pressure High temperature and highpressure Answer The bond dissociation energies of X2, Y2 and XY are in the ratio of 1 : 0.5: 1. ΔH for the formation of XY is –200 kJ mol–1. The bond dissociation energy of X2 willbe 200 kJmol-1 100 kJmol-1 400 kJmol-1 800 kJ mol-1 Answer The correction factor ‘a’ to the ideal gas equation corresponds to Density of the gasmolecules Volume of the gasmolecules Forces of attraction between the gas molecules Electric field present between the gasmolecules Answer Which one is a wrongstatement? Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

3. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. Totalorbitalangularmomentumofelectronin's'orbitalisequaltozero An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantumnumbers The value of m for dz2 iszero The electronic configuration of N atomis Answer Magnesium reacts with an element (X) to form an ionic compound. If the ground stateelectronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is Mg2X3 MgX2 Mg3X2 Mg2X Answer In the structure of ClF3, the number of lone pair of electrons on central atom ‘Cl’ is One Two Three Four Answer The correct order of atomic radii in group 13 elements is B < Al < In < Ga <Tl B < Al < Ga < In < Tl B < Ga < Al < In < Tl B < Ga < Al < Tl <In Answer Which of the following oxides is most acidic in nature? MgO BeO CaO BaO Answer Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

4. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. Whichoxideofnitrogenisnotacommonpollutantintroducedintotheatmospherebothduetonaturaland humanactivity? N2O5 NO2 NO N2O Answer Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms? HC≡C-C≡CH CH2=CH-C≡CH CH3-CH=CH-CH3 CH2=CH-CH=CH2 Answer Which of the following is correct with respect to – I effect of the substituents? (R =alkyl) -NH2 <- OR < -F -NR2 <- OR<-F -NR2>-OR>-F -NH2>-OR>-F Answer In which case is a number of molecules of water maximum? 18 mL ofwater 0.18 g ofwater 10-3 mol ofwater 0.00224 L of water vapours at 1 atm and 273K Answer 14. Among CaH2, BeH2, BaH2, the order of ionic character is BeH2<CaH2<BaH2 CaH2<BeH2<BaH2 BaH2<BeH2<CaH2 BeH2 < BaH2 <CaH2 Answer Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

5. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. 15. For the redoxreaction MnO4- + C2O4-2 + H+ → Mn2+ + CO2 +H2O The correct coefficients of the reactants for the balanced equationare H+ MnO4- C2O42- 16 5 2 H+ - MnO4 2- C2O4 2 5 16 H+ - MnO4 2- C2O4 5 16 2 H+ - MnO4 2- C2O4 2 16 5 Answer Which one of the following elements is unable to form MF6-3 ion? Ga Al In B Answer Considering the Ellingham diagram, which of the following metals can be used to reduce alumina? Fe Zn Cu Mg Answer Which of the following statements is not true for halogens? All form monobasicoxyacids Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

6. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. All are oxidizingagents Chlorine has the highest electron-gain enthalpy All but fluorine show positive oxidationstates Answer A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in gram) of the remaining product atSTP will be 1.4 3.0 4.4 2.8 Answer Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code: ColumnI ColumnII Co3+ a. i. 8 BM Cr3+ b. ii. 35BM Fe3+ c. iii. 3 BM Ni2+ d. iv. 24BM v. 15BM a b cd ivviii a b c d i ii iii iv a b cd Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

7. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. • iii v iii • a b cd iv i iiiii • Answer • Which one of the following ions exhibits d-d transition and paramagnetism as well? CrO42- • Cr2O72- MnO42- MnO4- • Answer • Iron carbonyl, Fe(CO)5is • Tetranuclear Mononuclear Dinuclear Trinuclear • Answer • The type of isomerism shown by the complex [CoCl2(en)2] is Geometricalisomerism • Coordinationisomerism • Linkage isomerism Ionizationisomerism • Answer • The geometry and magnetic behaviour of the complex [Ni(CO)4] are Square planar geometry anddiamagnetic • Tetrahedral geometry anddiamagnetic • Tetrahedral geometry and paramagnetic Square planar geometry andparamagnetic • Answer • FollowingsolutionswerepreparedbymixingdifferentvolumesofNaOHandHClofdifferentconcentrations • : • 60mLM10HCl+40mLM10NaOHb)55mLM10HCl+45mLM10NaOHc)75mLM5HCl+25mLM5N Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

8. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. aOHd) 100 mL M10 HCl + 100 mLM10NaOH pH of which one of them will be equal to1? b a c d Answer On which of the following properties does the coagulating power of an ion depend? The magnitude of the charge on the ionalone Size of the ionalone The sign of the charge on the ionalone Both magnitude and sign of the charge on the ion Answer Given van der Waals constant for NH3, H2, O2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easilyliquefied? NH3 H2 CO2 O2 Answer ThesolubilityofBaSO inwateris2.42×10–3 gL–1 at298K.Thevalueofitssolubilityproduct(K willbe 4 sp) (Given the molar mass of BaSO = 233 gmol–1) 4 1.08 x 10-10mol2L-2 1.08 x 10-12mol2L-2 1.08 x 10-8mol2L-2 1.08 x 10-14mol2L-2 Answer The correct difference between first and second order reactions isthat The rate of a first-order reaction does not depend on reactant concentrations; the rate of a second- order reaction does depend on reactantconcentrations The half-life of a first-order reaction does not depend on [A]; the half-life of a second-order reaction does depend on[A] Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

9. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. The rate of a first-order reaction does depend on reactant concentrations; the rate of asecond-order reaction does not depend on reactantconcentrations A first-order reaction can catalyzed; a second-order reaction cannot be catalyzed Answer When initial concentration of the reactant is doubled, the half-life period of a zero order reaction Ishalved Isdoubled Remains unchanged Istripled Answer Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature)is 32 4332 1/2 3342 Answer Consider the followingspecies: CN+, CN–, NO andCN Which one of these will have the highest bondorder? NO CN- CN CN+ Answer The correct order of N-compounds in its decreasing order of oxidation states is HNO3, NH4Cl, NO,N2 HNO3, NO,NH4Cl, N2 HNO3, NO, N2, NH4Cl NH4Cl, N2, NO,HNO3 Answer Identify the major products P, Q and R in the following sequenceof reactions: Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

10. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. Answer 35. Which of the following compounds can form a zwitterion? Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

11. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. Aniline Acetanilide Glycine Benzoicacid Answer Regarding cross-linked or network polymers, which of the following statements is incorrect? Theycontaincovalentbondsbetweenvariouslinearpolymerchains. They are formed from bi- and tri-functional monomers. They contain strong covalent bonds in their polymer chains. Examples are bakelite andmelamine. Answer Nitration of aniline in strong acidic medium also gives m-nitroaniline because Inspite of substituents nitro group always goes to only m-position. In electrophilic substitution reactions amino group is meta directive. In acidic (strong) medium aniline is present as aniliniumion. In absence of substituents nitro group always goes tom-position. Answer The difference between amylose and amylopectin is Amylopectin have 1 → 4 α-linkage and 1 → 6 α-linkage Amylose have 1 → 4 α-linkage and 1 → 6 β-linkage Amylose is made up of glucose and galactose Amylopectin have 1 → 4 α-linkage and 1 → 6β-linkage Answer The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in theorder C2H5OH, C2H6,C2H5Cl C2H5OH, C2H5Cl, C2H5ONa C2H5OH, C2H5ONa, C2H5Cl C2H5Cl, C2H6,C2H5OH Answer The compound C7H8 undergoes the following reactions: C7H8 →3Cl2/∆A →Br2/Fe B →Zn/HClC The product 'C'is m-bromotoluene Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

12. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. o-bromotoluene p-bromotoluene 3-bromo-2,4,6-trichlorotoluene Answer Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is convertedtoagaseoushydrocarboncontaininglessthanfourcarbonatoms.(A)is CH ≡ CH H2C =CH2 CH4 CH3-CH3 Answer Which of the following carbocations is expected to be moststable? Answer Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com

13. Chemistry NEET 2018 Exam Year 2018 Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever. 43. In thereaction, The electrophile involvedis Dichloromethyl cation (C+HCl) 2 Formyl cation (C+HO) Dichlorocarbene(:CCl2) Dichloromethyl anion (C-HCl) 2 Answer Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due totheir Formation of intramolecular H-bonding Formation of intermolecular H-bonding Formation of intermolecularH-bonding More extensive association of carboxylic acid via Vander Waals force of attraction Answer Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y arerespectively Answer Like. Share. Bookmark. Download. Make Notes. Print - Your Favourite Questions. Joinwww.zigya.com