The molar conductivity of strong electrolytes follows which relationship with concentration?

The correct answer is B: Decreases with √concentration according to Debye-Hückel law. For strong electrolytes: Λm = Λ°m - A√c (Debye-Hückel-Onsager equation), showing decrease with √c.

The coordination number of Cu²⁺ in CuSO₄·5H₂O is:

The correct answer is B: 6. Cu²⁺ is surrounded by 4 water molecules in the coordination sphere and 2 more from the sulfate ion or additional water molecules, giving octahedral geometry with coordination number 6.

For the reaction: (1) Cl₂ ⇌ 2Cl (fast), (2) Cl + H₂ → HCl + H (slow), (3) H + Cl₂ → HCl + Cl (fast). The overall reaction is:

The correct answer is A: Cl₂ + H₂ → 2HCl. Adding all steps and canceling intermediates (Cl, H): Cl₂ + H₂ → 2HCl

The conductivity of a solution decreased upon dilution. This is because:

The correct answer is B: Number of ions per unit volume decreases. Conductivity (κ) = concentration × molar conductivity. Upon dilution, concentration decreases faster than molar conductivity increases.

In the preparation of chlorine by oxidizing HCl with MnO₂, the oxidation state of Mn changes from:

The correct answer is B: +4 to +2. MnO₂ (Mn⁴⁺) acts as oxidizing agent, reducing Cl⁻ to Cl₂. Mn⁴⁺ gains 2 electrons, reducing to Mn²⁺.

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Electrochemistry

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

22 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–22 of 22

Topics in JEE Chemistry

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

Q.21 Hard Electrochemistry

For the reaction: Zn + Cu²⁺ → Zn²⁺ + Cu, if the concentration of Cu²⁺ is increased at constant temperature, the cell potential will:

A Decrease

B Increase

C Remain unchanged

D First increase then decrease

Correct Answer: B. Increase

EXPLANATION

Using the Nernst equation, E = E° + (0.0592/2) log([Zn²⁺]/[Cu²⁺]). Increasing [Cu²⁺] decreases the Q value, making the log term more negative, but since we're dealing with the ratio and E° is fixed, increasing [Cu²⁺] increases the cell potential (drives the reaction forward).

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Q.22 Hard Electrochemistry

A cell has E°cell = 0. This means:

A ΔG° = 0, the system is at equilibrium

B The reaction is non-spontaneous

C K = 1 at 25°C

D Both A and C are correct

Correct Answer: D. Both A and C are correct

EXPLANATION

When E°cell = 0, ΔG° = -nFE°cell = 0, indicating the system is at equilibrium. Since ΔG° = -RT ln K, when ΔG° = 0, ln K = 0, so K = 1.

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