For the following Assertion and Reason, the correct option is:

Assertion: The pH of water increases with increase in temperature.

Reason: The dissociation of water into and is an exothermic reacti

Question

For the following Assertion and Reason, the correct option is:

Assertion: The pH of water increases with increase in temperature.

Reason: The dissociation of water into  and  is an exothermic reaction.

Canvas Classes · Accepted Answer

Step 1 — Evaluate Assertion:
At higher temperature,  increases (more dissociation of water). At 25 °C, pH of pure water = 7. At higher T,  increases  pH decreases (e.g., at 60 °C, pH ≈ 6.5).

However, the water is still neutral (pH = pOH) — just the neutral point shifts.

Assertion: pH of water DECREASES with temperature  Assertion is FALSE ✗

Step 2 — Evaluate Reason:
The dissociation of water:  is endothermic (requires energy to break O–H bonds), NOT exothermic.
Reason is FALSE ✗

Answer: Opti

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