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Q.

During discharge of a lead storage cell the density of sulphuric acid in the cell:

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a

Increasing

b

decreasing

c

remains unchanged

d

initially increases but decrease subsequently

answer is B.

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Detailed Solution

Discharging reaction Pb(s)+PbO2(s)+2H2SO4→2PbSO4+2H2OMechanism:Pb+SO4-2→PbSO4+2e- PbO2+4H+SO4-2+2e-→ PbSO4+2H2OIn this process the H2SO4 is consumed and residual water is left behind or evaporated.So,density of sulphuric acid decreases.
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