Important Questions of Electrochemistry Chemistry | Zigya

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 Multiple Choice QuestionsShort Answer Type

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281. How long will it take to deposit electrolytically 127 gm of copper on the cathode of a copper voltameter by a current of 50A? Given ECE of copper = 0.0003294 g/c.
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282. An electric current of 0.5 ampere was passed through acidulated water for one hour. Calculate the volume of hydrogen at STP produced. 1 coulomb of electricity deposits 0.00001 gm of hydrogen.
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 Multiple Choice QuestionsLong Answer Type

283.

How much charge is required for the following reduction of
(i) 1 mol of Al3+ to Al
(ii) 1 mol of Cu2+ to Cu
(iii) 1 mol of MnO4– to Mn2+

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 Multiple Choice QuestionsShort Answer Type

284. A solution of CuSO4 is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode? (at mass Cu = 63.5).
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285. A solution of CuSO4 is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?
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286. Represent the cell in which the following reaction takes place:
Mg(s) + 2Ag+ (0.0001 M) → Mg2+(0.130 m) + 2Ag(s)
Calculate its E(cell), if E°cell = 3.17 V.
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 Multiple Choice QuestionsLong Answer Type

287.

A Cell is prepared by dipping a copper rod in 0.01 M copper sulphate solution, and zinc rod in 0.02 M ZnSO4 solution. The standard reduction potentials of copper and zinc are + 0.34 V and – 0.76 V respectively.
(a) What will be the cell reaction?
(b) How will the cell be represented?
(c) What will be the emf. of the cell?

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288. Calculate the standard electrode potential of the Mg2+ / Mg electrode for a cell in which the cell reaction is
Mg(s) + 2Ag+(aq) → Mg2+(aq) + 2Ag(s)
Given that, [Mg2+] = 0.1 M, [Ag+] = 0.01 M
Ag/Ag = + 0.80, Ecell = + 2.90 V

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289.

Write the Nernst equation and calculate the emf of the following cell at 298 K:
Pt(s) | Br2 (l) Br– (0.01M) || H+ (0.03 M) | H2(g) (1 bar) | Pt(s)
Given E°Br2/Br– = + 1.08 V
Br/ Br

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 Multiple Choice QuestionsShort Answer Type

290. Calculate the equilibrium constant of the reaction
Cu(s)+2Ag+(aq)   Cu2+(aq) + 2Ag(s)
given : E0 =0.46 temperture 250
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