In the electrolysis of CuSO₄ solution with copper electrodes, what happens at the cathode?

The correct answer is B: Cu²⁺ is reduced to Cu. At the cathode (reduction occurs), Cu²⁺ + 2e⁻ → Cu. This is why copper electrorefining works - pure copper deposits on the cathode.

A reaction mechanism consists of: Step 1 (slow): A + B → C; Step 2 (fast): C + D → E. The overall reaction is A + B + D → E. What is the rate law?

The correct answer is B: Rate = k[A][B]. Rate law depends on the rate-determining step (slowest step). Step 1 is slow: A + B → C, so Rate = k[A][B]. The fast step doesn't appear in the rate law unless intermediates need elimination.

Which statement about the aldol condensation is correct?

The correct answer is B: It produces a β-hydroxy carbonyl compound as the intermediate product. Aldol condensation produces a β-hydroxy carbonyl compound (aldol) initially, which can further dehydrate under heating to form an α,β-unsaturated carbonyl compound.

Which statement correctly defines chemical potential?

The correct answer is B: It is the partial molar Gibbs free energy of a substance. Chemical potential μᵢ = (∂G/∂nᵢ)T,P, which is the partial molar Gibbs free energy

Which isomer of dimethylbenzene (xylene) will show only 2 signals in 1H-NMR?

The correct answer is C: para-xylene. Para-xylene has high symmetry: all four aromatic protons are equivalent (one signal) and all six methyl protons are equivalent (one signal), giving only 2 total signals in 1H-NMR.

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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 21–30 of 31

Topics in JEE Chemistry

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

Q.21 Easy Physical Chemistry

Which of the following is a colligative property?

A Vapor pressure of solvent

B Boiling point elevation

C Color of solution

D Solubility of solute

Correct Answer: B. Boiling point elevation

EXPLANATION

Boiling point elevation depends only on the number of solute particles, not their identity, making it a colligative property.

Test

Q.22 Easy Physical Chemistry

The Henry's law constant for CO₂ in water at 25°C is 1.67 × 10⁻³ mol/(L·atm). What is the solubility of CO₂ when its partial pressure is 0.8 atm?

A 1.34 × 10⁻³ mol/L

B 2.09 × 10⁻³ mol/L

C 0.134 mol/L

D 1.34 mol/L

Correct Answer: A. 1.34 × 10⁻³ mol/L

EXPLANATION

Using Henry's Law: S = KH × P = 1.67 × 10⁻³ × 0.8 = 1.34 × 10⁻³ mol/L

Test

Q.23 Easy Physical Chemistry

A solution contains 0.1 M HCl and 0.1 M NaOH is added dropwise. At what point does the pH change most rapidly?

A At the start of addition

B At the equivalence point

C After addition is complete

D Midway through the titration

Correct Answer: B. At the equivalence point

EXPLANATION

The pH changes most steeply at the equivalence point in an acid-base titration because the buffer capacity is minimum at this point.

Test

Q.24 Easy Physical Chemistry

At 25°C, the solubility product (Ksp) of AgCl is 1.8 × 10⁻¹⁰. What is the molar solubility of AgCl in pure water?

A 1.34 × 10⁻⁵ M

B 4.24 × 10⁻⁶ M

C 2.68 × 10⁻⁵ M

D 9 × 10⁻¹¹ M

Correct Answer: A. 1.34 × 10⁻⁵ M

EXPLANATION

For AgCl ⇌ Ag⁺ + Cl⁻, Ksp = [Ag⁺][Cl⁻] = s × s = s². Therefore, s = √(1.8 × 10⁻¹⁰) = 1.34 × 10⁻⁵ M

Test

Q.25 Easy Physical Chemistry

The first ionization energy of sodium is lower than that of hydrogen because:

A Sodium has larger atomic radius

B Sodium has better shielding effect

C Sodium nucleus has lower charge

D Both A and B

Correct Answer: D. Both A and B

EXPLANATION

Both larger atomic radius and greater shielding effect in sodium make the valence electron easier to remove compared to hydrogen's single electron.

Test

Q.26 Easy Physical Chemistry

The osmotic pressure of a solution is given by:

A π = nRT/V

B π = MRT

C π = CRT

D π = dRT

Correct Answer: C. π = CRT

EXPLANATION

Osmotic pressure: π = CRT where C is molar concentration. It's a colligative property dependent on number of solute particles.

Test

Q.27 Easy Physical Chemistry

Which of the following is an extensive property?

A Refractive index

B Surface tension

C Entropy

D Density

Correct Answer: C. Entropy

EXPLANATION

Entropy is an extensive property (depends on amount of substance). Refractive index, surface tension, and density are intensive properties.

Test

Q.28 Easy Physical Chemistry

For a spontaneous process at constant T and P, the condition is:

A ΔH < 0

B ΔS > 0

C ΔG < 0

D ΔU < 0

Correct Answer: C. ΔG < 0

EXPLANATION

At constant temperature and pressure, ΔG < 0 is the criterion for spontaneity, where ΔG = ΔH - TΔS.

Test

Q.29 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.

Test

Q.30 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.

Test

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