The reduction potential values are

E°_Zn²⁺/Zn = – 0.76 V

E°_Fe²⁺/Fe = – 0.44 V

Thus, due to higher negative electro potential value of zinc than iron, iron cannot be coated on zinc.

$${\Lambda _m} = {{\kappa \times 1000} \over {Molality}}$$

= $${{5.76 \times {{10}^{ - 3}} \times 1000} \over {0.5}}$$

= 11.52 S cm²/mol

A device that converts energy of combustion of fuels, directly into electrical energy is known as fuel cell.

$$\mathop {MnO_4^{2 - }}\limits_{0.1\,mole}^{ - 6} $$ $$ \to $$ $$\mathop {MnO_4^ - }\limits^{ - 7} $$ + e^-

Quantity of electricity required = 0.1F

= 0.1 × 96500 = 9650 C