Which pair of substances will form an ideal solution?

The correct answer is B: Benzene and toluene. Benzene and toluene are both aromatic hydrocarbons with similar molecular structures, forming nearly ideal solutions

Which of the following is the correct order of acidity for carboxylic acids?

The correct answer is A: Formic > Acetic > Propionic. As alkyl chain length increases, the electron-donating effect of the alkyl group increases, destabilizing the conjugate base carboxylate ion. Thus, formic acid (no alkyl group) is most acidic.

The bond angle in PCl₃ molecule is approximately:

The correct answer is B: 101.8°. PCl₃ has trigonal pyramidal geometry due to one lone pair on P. The bond angle is reduced from 120° (ideal trigonal) to 101.8° due to lone pair repulsion.

In the reaction 2KMnO₄ + 16HCl → 2KCl + 2MnCl₂ + 5Cl₂ + 8H₂O, the reducing agent is:

The correct answer is B: HCl. In this reaction, HCl acts as a reducing agent because Cl⁻ (oxidation state -1) is oxidized to Cl₂ (oxidation state 0). Mn in KMnO₄ is reduced from +7 to +2.

The cell potential of a galvanic cell decreases during operation because:

The correct answer is B: The concentration of products increases. As the reaction proceeds, product concentrations increase while reactant concentrations decrease, reducing the driving force according to Nernst equation: E = E° - (0.059/n)log(Q).

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JEE Chemistry
Physical Chemistry

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

31 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–31 of 31

Topics in JEE Chemistry

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

Q.31 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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