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pH of water is 7.0 at 250C. If water is heated to 700C, the

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pH will decrease and solution becomes acidic
pH will increase
pH will remain constant as 7
pH will decrease but solution will be neutral

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detailed solution

Correct option is D

On heating water KW increases and thus pH scale for neutrality changes from 7 to some lower value, i.e., 6.8 or 6.3depending upon KW values.

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