During discharge of a lead storage cell the density of sulphuric acid in the cell:
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remains unchanged
- D. Initially increases but decreases subsequently
Explanation
During the discharge of a lead storage cell, the sulphuric acid (H2SO4) reacts with lead (Pb) and lead dioxide (PbO2) to form lead sulfate (PbSO4) and water (H2O). As a result, the concentration of sulphuric acid decreases, leading to a decrease in its density. Therefore, option B is correct. Option A is incorrect because the density decreases, not increases. Option C is incorrect because there is a change in density, and option D is incorrect because the density does not initially increase; it decreases consistently.
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