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Question

Which of the following expressions is/are true?

A
[H+]=[OH]=Kw for a neutral solution
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B
[OH]<Kw for an acidic solution
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C
pH+pOH=14 at all temperature
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D
[OH]=107 M at 25C
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Solution

The correct options are
A [H+]=[OH]=Kw for a neutral solution
B [OH]<Kw for an acidic solution
D [OH]=107 M at 25C
For neutral water,

Kw=[H+][OH] so [H+]=[OH]=Kw.

And for acidic solution as hydrogen ion conc. increases so hydroxide ion decreases and [OH]<Kw.

[OH]=107 M at 25oC and pH+pOH=14 at 25oC only.

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