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Question

The pH of solution at 25C which has twice as many hydroxide ion as in pure water at 25C, will be.

A
14
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B
9
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C
6.699
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D
7.301
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Solution

The correct option is D 7.301
Given,

Temp = 250 C

So, conc. of hydroxide in pure water is 107 M

A/C to this condition no of hydroxide ion is 2×107 M

So, pH = log[2×107]

7 + 0.301 = 7.301

pH = 7.301

Hence, option D is correct.

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