A feasible cell was constructed by joining the two half cells below. Cu²+ (aq) + 2e‾ → Cu(s) E° = – 0.76 V. What is the standard e.m.f. of the cell?
A. – 1.1V B. – 0.42V C. +0.42V D. +1.1V Correct Answer: Option D D. +1.1V Explanation e.m.f. = + 0.34 -(-0.76) = 0.34 + 0.76 = +1.1VIn the electrolysis of CuSO4(aq) using copper electrodes, the reaction at the anode is?
A. discharge of SO4²‾ B. discharge of OH‾ C. dissolution of copper electrode D. evolution of oxygen Correct Answer: Option C C. dissolution of copper electrodeGiven that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
A. S + P+ → P + S + B. Q + S+ → S + Q+ C. R + P+ → P + R+ D. S + Q+ → Q + S+ Correct Answer: Option B B. Q + S+ → S + Q+A concentrated solution containing H+, Cu²+, OH‾ and CI‾ was electrolysed using platinum electrodes which of the ions will be discharged at the cathodes?
A. H+ B. Cu²+ C. OH‾ D. CI‾ Correct Answer: Option B B. Cu²+Products
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