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SSC CGL
mediumQ. No. 14871

What is the pH of 0.001 M HCl at 25°C?

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The pH of 0.001 M hydrochloric acid is 3 at 25°C. HCl is a strong monoprotic acid and, in a dilute aqueous solution, it dissociates almost completely: HCl → H⁺ + Cl⁻. Therefore, the hydrogen-ion concentration is approximately [H⁺] = 0.001 M = 10⁻³ M. Hydrochloric acid is a strong monoprotic acid, so 0.001 M HCl dissociates essentially completely and gives approximately 0.001 M H⁺. Since 0.001 = 10⁻³, the pH is 3.

A1
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C3
D4
Correct Answer: 3Your Answer: C

Explanation

No multiplication by the chloride concentration is needed because one mole of HCl supplies approximately one mole of H⁺ in this dilute strong-acid treatment.

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SSC CGL Chemistry FAQs

Common questions and clear answers for this topic.

What is the pH of 0.001 M HCl?

The pH is 3 at 25°C.

Why does HCl concentration equal hydrogen-ion concentration here?

HCl is a strong monoprotic acid and dissociates almost completely in dilute water.

What hydrogen-ion concentration corresponds to pH 3?

Approximately 1 × 10⁻³ M.

Would 0.001 M acetic acid also have pH 3?

Not exactly; acetic acid is weak and does not dissociate completely.

How many chemistry questions typically appear in the SSC CGL exam?

Chemistry usually contributes a handful of questions within the General Awareness section, generally covering basic concepts rather than calculation-heavy problems.

Which chemistry topics are most important for SSC CGL preparation?

Atomic structure, periodic table trends, acids-bases-salts, metals and non-metals, and carbon compounds are the areas that appear most consistently across past papers.

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