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Question

The value of pKw of water will :

A
Increases with increase in temperature
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B
Decreases with increase in temperature
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C
Does not change with variation in temperature
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D
Increase till 50 oC temperature and there after decreases.
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Solution

The correct option is B Decreases with increase in temperature
The value of Kw increases with rise in temperature, because dissociation of water an endothermic process.
pKw=log[Kw]
Now, as Kw increases, then pKw i.e. the negative log value therefore it gives the reverse effect.
So, the value of pKw of neutral water decreases with rise in temperature.

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