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JEE Chemistry

Chemistry questions for JEE Main — Physical, Organic, Inorganic Chemistry.

143 Q 5 Topics Take Test

Difficulty: All Easy Medium Hard 141–143 of 143

Topics in JEE Chemistry

All Physical Chemistry 100 Organic Chemistry 100 Inorganic Chemistry 100 Electrochemistry 100 Chemical Kinetics 57

Q.141 Easy Physical Chemistry

Which colligative property is independent of the nature of solute?

A Optical activity

B Boiling point elevation

C Refractive index

D Specific rotation

Correct Answer: B. Boiling point elevation

EXPLANATION

Boiling point elevation depends only on the number of solute particles (molality), not on their chemical nature.

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Q.142 Easy Physical Chemistry

The vapour pressure of a liquid depends on:

A Surface area only

B Temperature and nature of the liquid

C Volume of the liquid

D Atmospheric pressure

Correct Answer: B. Temperature and nature of the liquid

EXPLANATION

Vapour pressure depends on temperature (increases with temperature) and the nature of intermolecular forces in the liquid, not on surface area or volume.

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Q.143 Easy Physical Chemistry

Which of the following has the highest lattice energy?

A NaCl

B MgO

C KCl

D CaO

Correct Answer: B. MgO

EXPLANATION

MgO has the highest lattice energy due to smaller ionic radii of Mg²⁺ and O²⁻ ions, leading to stronger electrostatic attractions.

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