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SSC CGL
mediumQ. No. 14938-the-principal-quantum-number-n-determines

The principal quantum number n determines

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This SSC CGL Chemistry question asks: “The principal quantum number n determines” The correct answer is Energy and size of orbital. Principal quantum number n determines the energy level (shell) and the size of the atomic orbital. Chemistry explains the composition, structure, properties and transformations of matter. A reliable answer begins by identifying whether the question concerns atomic structure, chemical bonding, periodicity, stoichiometry, acids and bases, redox chemistry, electrochemistry, organic nomenclature, metallurgy or everyday materials. Formulae and equations must be interpreted rather than memorised without context. Numerical problems require the correct molar mass, unit conversion and significant figures.

AShape of orbital
BOrientation of orbital
CEnergy and size of orbital
DNumber of electrons in orbital
Correct Answer: Energy and size of orbitalYour Answer: C

Explanation

rmines the energy level (shell) and the size of the atomic orbital. Option A (“Shape of orbital”) 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 (“Orientation of orbital”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Number of electrons in orbital”) 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 Energy and size of orbital. Principal quantum number n determines the energy level (shell) and the size of the atomic orbital.

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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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