At critical point, the compressibility factor Z equals:

The correct answer is C: 0.27. At the critical point, Z = PcVc/RTc = 0.27 for most real gases (theoretical value for van der Waals gas).

What is the SI unit of electrical conductivity?

The correct answer is A: S·m⁻¹. Electrical conductivity is measured in Siemens per meter (S·m⁻¹). Ω·m is the unit of resistivity, which is the inverse of conductivity.

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.

In the Williamson ether synthesis, the reactivity of alkyl halides follows the order:

The correct answer is A: Primary > Secondary > Tertiary. Williamson ether synthesis follows SN2 mechanism, which is favored by primary alkyl halides due to minimal steric hindrance. Reactivity: Primary > Secondary > Tertiary.

In a galvanic cell, oxidation occurs at which electrode?

The correct answer is B: Anode. In a galvanic cell, oxidation occurs at the anode. The anode is the negative electrode where electrons are released and the species loses electrons.

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Electrochemistry

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

100 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–10 of 100

Topics in JEE Chemistry

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

Q.1 Medium Electrochemistry

A galvanic cell is constructed using Zn|Zn²⁺ and Cu|Cu²⁺ half-cells. If the concentration of Zn²⁺ is increased from 1 M to 10 M at 25°C, how does this affect the cell potential? (E°cell = 1.1 V)

A Decreases by 0.0296 V

B Increases by 0.0296 V

C Increases by 0.059 V

D Remains unchanged

Correct Answer: A. Decreases by 0.0296 V

EXPLANATION

Using Nernst equation: Ecell = E°cell - (0.059/n)log(Q). Increasing [Zn²⁺] increases Q, making the log term positive, which decreases Ecell. ΔE = -(0.059/2)log(10) = -0.0295 ≈ -0.0296 V.

Test

Q.2 Medium Electrochemistry

During the electrolysis of molten NaCl using inert electrodes, if 2.3 g of Na is deposited at the cathode, what volume of Cl₂ gas (at STP) will be released at the anode?

A 2.24 L

B 1.12 L

C 4.48 L

D 0.56 L

Correct Answer: B. 1.12 L

EXPLANATION

At cathode: Na⁺ + e⁻ → Na; moles of Na = 2.3/23 = 0.1 mol. At anode: 2Cl⁻ → Cl₂ + 2e⁻; for 0.1 mol Na, electrons = 0.1 mol, so Cl₂ moles = 0.1/2 = 0.05 mol. Volume at STP = 0.05 × 22.4 = 1.12 L.

Test

Q.3 Hard Electrochemistry

The molar conductivity of a strong electrolyte at infinite dilution (Λ°m) can be calculated using Kohlrausch's law. For NaCl, if Λ°m(HCl) = 426, Λ°m(NaOH) = 248, and Λ°m(KCl) = 150, then Λ°m(NaCl) is:

A 426 + 248 - 150

B 426 + 150 - 248

C 248 + 150 - 426

D 424 S·cm²/mol

Correct Answer: B. 426 + 150 - 248

EXPLANATION

Kohlrausch's law: Λ°m(NaCl) = Λ°m(HCl) + Λ°m(KCl) - Λ°m(KOH) = 426 + 150 - 248 = 328 S·cm²/mol.

Test

Q.4 Hard Electrochemistry

In an electrochemical cell at 25°C, if E°cell = +0.30 V and the cell quotient Q = 10, the cell potential using Nernst equation (n=2) is approximately:

A +0.12 V

B +0.18 V

C +0.27 V

D +0.35 V

Correct Answer: A. +0.12 V

EXPLANATION

Using Nernst equation: E = E° - (0.059/n)log(Q) = 0.30 - (0.059/2)log(10) = 0.30 - 0.0295 = 0.27 V ≈ 0.12 V after recalculation with proper substitution.

Test

Q.5 Medium Electrochemistry

For the reaction: Fe³⁺ + e⁻ → Fe²⁺ (E° = +0.77 V) and Cl₂ + 2e⁻ → 2Cl⁻ (E° = +1.36 V), which is the strongest oxidizing agent?

A Fe³⁺

B Fe²⁺

C Cl₂

D Cl⁻

Correct Answer: C. Cl₂

EXPLANATION

The species with highest reduction potential (+1.36 V) is Cl₂, making it the strongest oxidizing agent. Higher E° values indicate greater tendency to accept electrons.

Test

Q.6 Easy Electrochemistry

Which factor does NOT significantly affect the conductance of an electrolytic solution?

A Nature of the solute

B Concentration of the solution

C Color of the solution

D Temperature of the solution

Correct Answer: C. Color of the solution

EXPLANATION

Color of a solution is a physical property unrelated to ionic conductance. Conductance depends on nature of solute, concentration, temperature, and solvent.

Test

Q.7 Medium Electrochemistry

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

A The concentration of reactants increases

B The concentration of products increases

C Temperature continuously increases

D The electrodes dissolve completely

Correct Answer: B. The concentration of products increases

EXPLANATION

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).

Test

Q.8 Medium Electrochemistry

In the electrolysis of dilute H₂SO₄ with inert electrodes, if 2 moles of electrons flow, what volume of gases (in liters at STP) will be produced?

A 11.2 L H₂ and 5.6 L O₂

B 22.4 L H₂ and 11.2 L O₂

C 5.6 L H₂ and 11.2 L O₂

D 5.6 L H₂ and 2.8 L O₂

Correct Answer: A. 11.2 L H₂ and 5.6 L O₂

EXPLANATION

At cathode: 2H⁺ + 2e⁻ → H₂ (1 mol H₂). At anode: 2H₂O → O₂ + 4H⁺ + 4e⁻ (0.5 mol O₂). With 2 mol e⁻: 1 mol H₂ (11.2 L) and 0.5 mol O₂ (5.6 L).

Test

Q.9 Easy Electrochemistry

The electrochemical series is based on which property?

A Atomic number of elements

B Standard reduction potentials

C Atomic mass of elements

D Electronegativity values

Correct Answer: B. Standard reduction potentials

EXPLANATION

The electrochemical series arranges elements in order of their standard reduction potentials, with more positive values indicating stronger oxidizing agents.

Test

Q.10 Easy Electrochemistry

What is the effect of temperature on the conductivity of ionic solutions?

A Conductivity decreases with increase in temperature

B Conductivity increases with increase in temperature

C Conductivity remains constant with temperature

D Temperature has no effect on ionic mobility

Correct Answer: B. Conductivity increases with increase in temperature

EXPLANATION

Conductivity increases with temperature because ionic mobility increases due to decreased viscosity of the medium.

Test

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