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SSC CGL
mediumQ. No. 14876-in-which-reaction-does-s-oxidation-number-increase

In which reaction does S oxidation number increase?

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This SSC CGL Chemistry question asks: “In which reaction does S oxidation number increase?” The correct answer is SO2 to SO3. S in SO2 has +4 oxidation state and in SO3 has +6. Redox questions should identify oxidation as electron loss or increase in oxidation number and reduction as electron gain or decrease in oxidation number. Acid basicity refers to the number of ionisable protons, not simply the number of hydrogen atoms written in a formula. Examination distractors commonly use an outdated name, reverse oxidation and reduction, confuse an element with its compound, or insert a numerically plausible value with the wrong unit.

AH2SO4 to SO2
BS to H2S
CS to SO2
DSO2 to SO3
Correct Answer: SO2 to SO3Your Answer: D

Explanation

tate and in SO3 has +6. Option A (“H2SO4 to SO2”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“S to H2S”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“S to SO2”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Identify the governing formula, definition or reaction and apply it consistently. The answer field, correct index and explanation therefore all identify SO2 to SO3. S in SO2 has +4 oxidation state and in SO3 has +6.

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FAQ

SSC CGL Chemistry FAQs

Common questions and clear answers for this topic.

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.

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