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mediumQ. No. 14871

25°C पर 0.001 M HCl का pH कितना है?

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25°C पर 0.001 M hydrochloric acid का pH 3 होता है। HCl एक strong monoprotic acid है और पतले aqueous solution में लगभग पूरी तरह dissociate होता है: HCl → H⁺ + Cl⁻। इसलिए hydrogen ion concentration लगभग [H⁺] = 0.001 M = 10⁻³ M होगी। Hydrochloric acid strong monoprotic acid है, इसलिए 0.001 M HCl लगभग पूरी तरह dissociate होकर लगभग 0.001 M H⁺ देता है। 0.001 = 10⁻³ होने से pH = 3 मिलता है।

A1
B2
C3
D4
Correct Answer: 3Your Answer: C

Explanation

HCl जैसे strong acid के 0.001 M solution में [H⁺] ≈ 10⁻³ M होता है। Chloride concentration से multiplication की आवश्यकता नहीं है, क्योंकि dilute strong-acid treatment में एक mole HCl लगभग एक mole H⁺ देता है।

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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.

Is NCERT chemistry enough to prepare for SSC CGL?

NCERT textbooks from classes 9 and 10 cover most of the conceptual base needed, though supplementing with general knowledge about everyday chemical compounds helps too.

What is the best way to remember chemical reactions and formulas for SSC CGL?

Linking reactions to real-world examples, like rusting or antacids, makes them easier to recall than memorizing formulas in isolation.

Does the SSC CGL chemistry syllabus overlap with the school board syllabus?

Yes, a large part of the syllabus mirrors class 9 and 10 science, making school-level revision a practical starting point.