pH value of which one of the following is not equal to one?

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pH value of which one of the following is not equal to one?

ChemistryIonic EquilibriumKCETKCET 2010

Options:

A $0.1 \mathrm{M} \mathrm{HNO}_{3}$
B $0.05 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$
C $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$
D $50 \mathrm{~cm}^{3}$ of $0.4 \mathrm{M}$ $\mathrm{HCl}+50 \mathrm{~cm}^{3}$ of $0.2 \mathrm{M} \mathrm{NaOH}$

Solution:

2760 Upvotes Verified Answer

The correct answer is: $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$

Among the given, $\mathrm{pH}$ of $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$ is not equal to one as $\mathrm{CH}_{3} \mathrm{COOH}$ is a weak acid, thus does not ionise completely.

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