Chemistry Past Questions and Answers

Which of the following substances decomposes when an electric current is passed through it?

A concentrated solution containing H<sup style='font-size: smaller;'>+</sup>, Cu<sup style='font-size: smaller;'>2+</sup>,OH<sup style='font-size: smaller;'>-</sup> and CI<sup style='font-size: smaller;'>-</sup> was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?

Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?

In the electrolysis of CuSO<sub style='font-size: smaller;'>4(aq)</sub> using copper electrodes, the reaction at the anode is

A feasible cell was constructed by joining the two half cells below. Cu<sup style='font-size: smaller;'>2+</sup><sub style='font-size: smaller;'>(aq)</sub> + 2e- → Cu<sub style='font-size: smaller;'>(s)</sub> E<sup style='font-size: smaller;'>o</sup> = - 0.76 V. What is the standard e.m.f. of the cell?