JEE Main Chemistry question

The pH of pure water at 25°C and 35°C are 7 and 6 respectively. The heat of formation of water from H⁺ and OH⁻ is:

Answer: (B)

Solution

Kw(298K)=10⁻¹⁴, Kw(308K)=10⁻¹². Van't Hoff analysis gives ΔH(ionization)≈+84.5

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Question ID VK-136504