Explain why:

(a) Cu, though a good conductor of electricity, is a non electrolyte.

(b) Solid sodium chloride does not allow electricity to pass through.

Complete and state whether the reaction is oxidation or reduction.
(a) Cl^- - e^- - ⟶ ……………
(b) Al - …………… ⟶ Al³⁺
(c) Pb²⁺ + …………… ⟶ Pb
(d) Sn⁴⁺ + …………… ⟶ Sn²⁺

Select the ion in each case that would get selectively discharged from the aqueous mixture of the ions listed below:

(a) SO₄^2-, NO₃^-, and OH^-

(b) Pb²⁺, Ag⁺, and Cu²⁺

(a) Among Zn and Cu, which would occur more readily in nature as metal and which as ion?

(b) Why cannot we store AgNO₃ solution in copper vessels?

(c) Out of Cu and Ag, which is more active?