CHEMISTRY DEPARTMENT WAID ACADEMY

1. CHEMISTRY DEPARTMENT WAID ACADEMY Redox and Faraday

2. 60 Seconds Remaining A solution of nickel(II) sulphate is electrolysed using nickel electrodes.The passage of 96500 coulombs results in • the negative electrode gaining 29.5 g • the positive electrode gaining 29.5 g • the negative electrode gaining 59 g • the positive electrode gaining 59 g

3. 60 Seconds Remaining What mass of copper metal, in grams, would be deposited by electrolysis of a solution of Cu2+(aq) ions if ½ Faraday of electrical energy were passed? • 63.5 g • 31.75 g • 15.875g • 7.95g

4. 60 Seconds Remaining In which of the following would a displacement reaction take place? • Bubbling chlorine gas through an aqueous solution of sodium fluoride. • Adding bromine solution to an aqueous solution of sodium chloride. • Adding bromine solution to an aqueous solution of sodium fluoride. • Bubbling chlorine gas through an aqueous solution of sodium iodide.

5. 60 Seconds Remaining If 96 500 coulombs of electrical charge are passed through separate solutions of copper(II) chloride and nickel(II) chloride, then • equal masses of copper and nickel will be deposited. • the same number of atoms of each metal will be deposited. • the metals will be plated on the positive electrode. • different numbers of moles of each metal will be deposited.

6. 60 Seconds Remaining During a redox reaction in acid solution, iodate ions, IO3-(aq) are converted into iodine, I2aq). IO3- I2The number of H+(aq)and H2O(l) required to balance the ion-electron equation for the formation of 1 mole of iodine are, respectively. • 6 and 3 • 3 and 6 • 12 and 6 • 6 and 12

7. 60 Seconds Remaining Which of the following is a redox reaction? • A • B • C • D

8. 60 Seconds Remaining How many moles of iodide ions are oxidised by one mole of permanganate ions? • 1 ½ • 2 • 2 ½ • 5

9. 60 Seconds Remaining What is the quantity of electricity needed to produce 0.25 moles of copper? • 24 125 C • 48 250 C • 96 500 C • 193 000C

10. 60 Seconds Remaining In which of the following reactions is hydrogen acting as an oxidising agent? • H2 + C2H4 C2H6 • H2 + Cl2  2HCl • H2 + 2Na  2NaH • H2 + CuO  Cu + H2O

11. 60 Seconds Remaining In a redox reaction 20 cm3 of 0.02 mol l-1 acidified potassium permanganate solution was used.How many moles of permanganate ions were used? • 0.4 mol • 2.0 mol • 0.0004 mol • 0.002 mol