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Solution


Q.

pH of water is 7 at 25°C. If water is heated to 80°C, its pH will :                [2025]
1 Remains the same  
2 Decrease  
3 Increase  
4 H+ concentration increases, OH- concentration decreases  

Ans.

(2)

H2O⇌H++OH-

With increase in temperature, dissociation of water increases, hence [H+] increases. Increase of [H+] means decrease of pH (pH=-log[H+]).