Ncert Exercises & Solutions

Match the items of Column I and Column II.

Codes:

Hint: Fuell cell has the maximum efficiency.

A. Chemical reaction occurring on lead storage battery can be represented as

At anode

Pb (s) + {SO}_{4}^{2 -} (aq) ⟶ {PbSO}_{4} (s) + 2 e^{-}

At Cathode

{PbO}_{2} (s) + {SO}_{4}^{2 - 4} (aq) + 4 H^{+} (aq) \overset{+ 2 e^{-}}{⟶} 2 {PbSO}_{4} (s) + 2 H_{2} O (l)

Thus, Pb is an anode and PbO₂ is a cathode.

B. Mercury cell does not include ions during their function hence produces a steady current.

C. Fuel cell has maximum efficiency as they produce energy due to combustion reaction of fuel.

D. Rusting is prevented by galvanization