# . What type of a battery is the lead storage battery

(a) What type of a battery is the lead storage battery? Write the anode and the cathode reactions and the overall reaction occurring in a lead storage battery when current is drawn from it.

(b) In the button cell, widely used in watches, the following reaction takes place

(a) Define molar conductivity of a solution and explain how molar conductivity changes with change in concentration of solution for a weak and a strong electrolyte.

(b) The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500 What is the cell constant if the conductivity of 0.001 M KCl solution at 298 K is 0.146 × 10^{–3} S cm^{–1}?

#### Best Answer

(a) Lead storage battery is a secondary battery. The reactions occurring in lead storage battery when current is drawn from it are:

** OR**

(a) Molar conductivity of a solution at a given concentration is the conductance of the volume V of the solution containing one mole of electrolyte kept between two electrodes with area of cross section A and distance of unit length.

(b) R = 1500 ; k = 0.146 × 10^{–3} S cm^{–1}

Substituting the values in the expression,

Cell constant = k × R

Cell constant = 0.146 × 10^{ –3} S cm^{–1} × 1500

= 0.219 cm^{–1}

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