Statement I: If 5 ml of an acid solution is completely neutralized by adding 5 ml of a base solution, the temperature of solution increases by x °C. If 20 ml of the same acid solution is completely ne

Question

Statement I: If 5 ml of an acid solution is completely neutralized by adding 5 ml of a base solution, the temperature of solution increases by x °C. If 20 ml of the same acid solution is completely neutralized by adding 20 ml of the same base solution, the temperature of solution increases by 4x °C.

Statement II: Heat liberated in the second case will be four times the heat liberated in the first case.

Prashant Kotian · Accepted Answer

Correct answer: D. In the second case, 4 times the moles of acid and base react, so the heat liberated is indeed 4 times the first case (q2 = 4q1). Thus, Statement II is correct. However, the volume of solution is also 4 times larger. Since ΔT = q / (m × s), the temperature rise is the same (ΔT2 = ΔT1 = x °C). So Statement I is incorrect.

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