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Which of the following is the value of hydroxyl ion concentration of pure water?

(a) 1 x 107 moles/litre 

(b) 1 x 105 moles/litre 

(c) 1 x 106 moles/litre 

(d) 1 x 108 moles/litre

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(a) 1 x 107 moles/litre 

\(pH=\frac{1}{OH^ -}\)

\(pH=[\frac{1}{10^7}]=7\)

Hence, pure water having pH → 7, will have 1 x 107 moles/litre concentration of [OH-] ions.

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