The \( \mathrm{pH} \) of a solution is 5 . To this solution acid was added so that its \( \mathr...

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The \( \mathrm{pH} \) of a solution is 5 . To this solution acid was added so that its \( \mathrm{pH} \) value becomes \( 2.0 \). The increase in \( \mathrm{H}^{+} \)concentration is :
(a) 100 times
(b) 5 times
(c) \( 2.5 \) times
(d) 1000 times
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