1.

Arrange the following according to the instructions given in brackets :(i) K, Pb, Ca, Zn. (In the increasing order of the reactivity)(ii) Mg2+, Cu2+, Na1+ , H1+(In the order of preferential discharge at the cathode)

Answer»

(i) Pb < Zn < Ca < K

(According to the position in reactivity series)

(ii) Na1+ < Mg2+ < H1+ < Cu2+

(According to electrochemical series of metals)



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