The approximate time duration in hours to electroplate 20 g of calcium from molten calcium chloride using a current of 4 A is (Atomic mass of $\mathrm{Ca}=40$ )

The equilibrium constant of the reaction

$A(s)+2 B^{+}(a q) \rightleftharpoons A^{2+}(a q)+2 B(s)$

$E_{\text {cell }}^{\circ}=0.0295 \mathrm{~V} \text { is } \quad\left[\frac{2.303 R T}{F}=0.059\right]$

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

A solution of copper sulphate is electrolyzed between copper electrodes by a current of 10.0A passing for one hour. Which of the following statements is correct regarding the changes occur at the electrodes and in the solution?