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NCERT Exemplar · Class 12 · Chemistry

Chapter 3: Electrochemistry

Practice each question, then open the answer or worked solution.

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II. Multiple Choice Questions (Type-II)

32 questions
Q48Written answer

Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged?

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Worked solution

Pb(s)+PbO2(s)+2H2SO4(aq)→ 2PbSO4(s) + 2H2O(l)

Density decreases as the product water form dilute the H2SO4 concentration during the discharge of the battery.

Q49Written answer

Why on dilution the ˄m of CH3COOH increases drastically, while that of CH3COONa increases gradually?

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Worked solution

CH3COOH is a weak electrolyte and CH3COONa is a strong electrolyte. A weak electrolyte has a lower degree of dissociation at higher concentration but upon dilution, the degree of dissociation increases, the number of ions per unit volume increases, and this lead to an increase in.