Using the standard electrode potential, find out the pair between which redox reaction is not feasible.

E$$^\Theta $$ values Fe³⁺ / Fe²⁺ = + 0.77; I₂ / I^$$-$$ = + 0.54 Cu²⁺ / Cu = + 0.34; Ag⁺ / Ag = 0.80 V

The molar conductivities of KCl, NaCl and KNO₃ are 152, 128 and 111 S cm² mol^$$-$$1 respectively. What is the molar conductivity of NaNO₃?

The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 A is (Atomic mass of Ca = 40)

Given, the reduction potential of Na⁺, Mg²⁺, Al³⁺ and Ag⁺ as $$E_{N{a^ + }/Na}^o$$ = $$-$$ 2.17 V; $$E_{M{g^{2 + }}/Mg}^o$$ = $$-$$ 2.37 V; $$E_{A{g^ + }/Ag}^o$$ = $$-$$ 0.08 V.

The least stable oxide is