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At 25°C the pH of water is 7. When temperature of water is increased to 70°C then pH of water and nature of water is

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pH will remain constant as 7

pH will decrease and the sample becomes acidic

pH will decrease but the sample will remain neutral

pH will increase but the sample will remain neutral

answer is D.

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Detailed Solution

High temperature pH and pOH of water decreases so, it will be less then 7 but [H⁺] = [OH^- ] So water remains neutral.

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