pH of water is 7.0 at 25 C.if water is heated to 70 C

A)pH will decrease and solution becomes acidic.

B)pH will increase

C)pH will remain constant as 7

D)pH will decrease but solution will be neutral

The correct answer is D. On heating, the extent of dissociation of water increases which leads to the increase in concentration of H+ ions as well as OH- ions. Hence the pH of water decreases, but due to the equal number of H+ and OH- ions, water remain neutral. 
Hence, the correct option is D. 
Please note the explanation is not in your course and will be dealt in higher grades. 

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C

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c is the right answer

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