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SSC CGL
hardQ. No. 14920-which-of-the-following-has-the-highest-lattice-energy

Which of the following has the highest lattice energy?

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This SSC CGL Chemistry question asks: “Which of the following has the highest lattice energy?” The correct answer is MgO. MgO has highest lattice energy due to Mg2+ and O2- having higher charges and smaller ionic radii compared to CaO. Periodic trends such as atomic size, ionisation energy and electronegativity depend on effective nuclear charge and shielding, so exceptions should be treated carefully. Option A (“NaCl”) 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 (“KCl”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question.

ANaCl
BKCl
CMgO
DCaO
Correct Answer: MgOYour Answer: C

Explanation

ges and smaller ionic radii compared to CaO. Option A (“NaCl”) 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 (“KCl”) 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 (“CaO”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify MgO. MgO has highest lattice energy due to Mg2+ and O2- having higher charges and smaller ionic radii compared to CaO.

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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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