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When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in
charged state
discharged state
both (a) and (b)
active state
charged state
Quick Summary: Given: Specific gravity of the electrolyte in a lead-acid cell is measured as 1.1 to 1.15.
Specific gravity of the electrolyte in a lead-acid cell is measured as 1.1 to 1.15.
SGdischarged≈1.10−1.15,SGcharged≈1.25−1.28
Identify Chemical Composition
In a lead-acid cell, the electrolyte is sulfuric acid. During the discharge process, the acid reacts with the lead plates to form lead sulfate, consuming the acid and reducing the specific gravity.
Pb+PbO2+2H2SO4→2PbSO4+2H2O
Analyze Specific Gravity Range
A fully charged lead-acid battery typically has a specific gravity between 1.25 and 1.28. As the battery discharges, the acid concentration drops.
SGcharged≈1.25−1.28
Determine State of Discharge
When the specific gravity falls to the range of 1.10 to 1.15, it indicates that most of the sulfuric acid has been converted into lead sulfate and water, signifying the cell is in a discharged state.
SGdischarged≈1.10−1.15
B is correct because a specific gravity of 1.1 to 1.15 indicates that the concentration of sulfuric acid in the electrolyte is very low, which is a characteristic marker of a discharged lead-acid battery.
Specific gravity is measured using a hydrometer; this concept is critical in battery maintenance and automotive electrical engineering.