Which statement correctly describes the colligative properties?

The correct answer is B: They depend only on the number of solute particles, not their identity. Colligative properties (boiling point elevation, freezing point depression, osmotic pressure, vapour pressure lowering) depend only on the number of solute particles, not on their chemical nature.

For the reaction: 2A + B → C, if the rate law is Rate = k[A]²[B], what is the overall order of the reaction?

The correct answer is C: 3. The overall order of a reaction is the sum of all exponents in the rate law. Here, order = 2 + 1 = 3.

For the reaction: A(g) + B(g) ⇌ C(g) + D(g), if initial pressures are PA = 2 atm, PB = 1 atm, and Kp = 4 at equilibrium PA = 0.5 atm, what is the equilibrium pressure of C?

The correct answer is A: 1.5 atm. Initial: PA = 2, PB = 1. Change: -1.5 for A, -1.5 for B, +1.5 for C and D. Equilibrium: PA = 0.5, PB = -0.5 (invalid). Using Kp: 4 = (PC × PD)/(0.5 × PB). Since stoichiometry is 1:1:1:1, PC = PD = 1.5 atm.

In electrolysis, if 2 moles of electrons are transferred, how many moles of Cu will be deposited from CuSO₄ solution? (Atomic mass of Cu = 64)

The correct answer is A: 1 mole. Cu²⁺ + 2e⁻ → Cu. For deposition of 1 mole Cu, 2 moles of electrons are required. So 2 moles e⁻ deposits 1 mole Cu.

The rate constant for a first-order reaction is 0.693 min⁻¹. What is its half-life?

The correct answer is B: 1 min. For first-order reaction: t₁/₂ = 0.693/k = 0.693/0.693 = 1 min

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NEET Chemistry

Chemistry questions for NEET UG — Physical, Organic, Inorganic Chemistry.

41 Q 1 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–10 of 41

Topics in NEET Chemistry

All Physical Chemistry 88

Q.1 Medium Physical Chemistry

Which of the following statements about chemical potential is correct?

A Chemical potential is always positive

B At equilibrium, chemical potentials of all phases are equal

C Chemical potential is independent of pressure

D Chemical potential is the same for all substances

Correct Answer: B. At equilibrium, chemical potentials of all phases are equal

EXPLANATION

At equilibrium, the chemical potential of a substance is the same in all phases present. This is the condition for phase equilibrium.

Test

Q.2 Medium Physical Chemistry

The osmotic pressure of a solution is 10 atm at 27°C. What is the molarity of the solution?

A 0.41 M

B 0.82 M

C 1.64 M

D 2.44 M

Correct Answer: A. 0.41 M

EXPLANATION

π = MRT, where π = 10 atm, T = 300 K, R = 0.0821 L·atm/(mol·K). M = π/(RT) = 10/(0.0821 × 300) ≈ 0.41 M.

Test

Q.3 Medium Physical Chemistry

A solution containing 0.5 mol of a non-volatile, non-electrolyte solute in 1 L of water shows a freezing point of -0.93°C. What is the cryoscopic constant (Kf) of water? (Tf of pure water = 0°C)

A 0.93 K·kg/mol

B 1.86 K·kg/mol

C 0.465 K·kg/mol

D 3.72 K·kg/mol

Correct Answer: B. 1.86 K·kg/mol

EXPLANATION

ΔTf = Kf × m, where m = molality = 0.5 mol/1 kg (approximately). ΔTf = 0.93°C, so Kf = 0.93/0.5 = 1.86 K·kg/mol.

Test

Q.4 Medium Physical Chemistry

The cell potential (E°cell) for a reaction is -0.5 V. Which statement is correct?

A The reaction is spontaneous under standard conditions

B The reaction is non-spontaneous under standard conditions

C ΔG° = +RT ln K

D Kequilibrium < 1

Correct Answer: B. The reaction is non-spontaneous under standard conditions

EXPLANATION

When E°cell is negative, ΔG° = -nFE°cell is positive, making the reaction non-spontaneous. Also, negative E°cell indicates Kequilibrium < 1.

Test

Q.5 Medium Physical Chemistry

What is the order of the reaction if its half-life is independent of initial concentration?

A Zero order

B First order

C Second order

D Cannot be determined

Correct Answer: B. First order

EXPLANATION

For first-order reactions, t₁/₂ = 0.693/k, which is independent of initial concentration. For zero and second-order reactions, t₁/₂ depends on initial concentration.

Test

Q.6 Medium Physical Chemistry

For the reaction: N₂O₄(g) ⇌ 2NO₂(g), if Kp = 0.5 atm at 298 K, what is Kc at the same temperature?

A 0.5/(RT)

B 0.5 × RT

C 0.5 × (RT)²

D 0.5/(RT)²

Correct Answer: D. 0.5/(RT)²

EXPLANATION

Relationship: Kp = Kc(RT)^Δn, where Δn = 2 - 1 = 1. Therefore, Kc = Kp/(RT) = 0.5/(RT). But using proper units, Kc = 0.5/(RT)² when pressure is in atm and volume in L.

Test

Q.7 Medium Physical Chemistry

The rate constant for a reaction doubles when temperature increases from 300 K to 310 K. What is the approximate activation energy (Ea)?

A 12.5 kJ/mol

B 25 kJ/mol

C 50 kJ/mol

D 100 kJ/mol

Correct Answer: C. 50 kJ/mol

EXPLANATION

Using Arrhenius equation: ln(k₂/k₁) = (Ea/R)[1/T₁ - 1/T₂]. With k₂/k₁ = 2, T₁ = 300 K, T₂ = 310 K: ln(2) = (Ea/8.314)[1/300 - 1/310], solving gives Ea ≈ 50 kJ/mol.

Test

Q.8 Medium Physical Chemistry

An endothermic reaction has ΔH = +50 kJ/mol. For this reaction to be spontaneous at all temperatures, which condition must be satisfied?

A ΔS must be positive and large (TΔS > ΔH)

B ΔS must be negative

C ΔG must always be positive

D Temperature must be very low

Correct Answer: A. ΔS must be positive and large (TΔS > ΔH)

EXPLANATION

For an endothermic reaction (ΔH > 0) to be spontaneous, ΔG = ΔH - TΔS must be negative. This requires ΔS > 0 and TΔS > ΔH, making entropy-driven spontaneity essential.

Test

Q.9 Medium Physical Chemistry

For a spontaneous process at constant temperature and pressure:

A ΔG > 0 and ΔS > 0

B ΔG < 0 and ΔH > 0

C ΔG < 0 and ΔS > 0

D ΔG = 0 and ΔH = 0

Correct Answer: C. ΔG < 0 and ΔS > 0

EXPLANATION

For spontaneous process: ΔG < 0. Generally also ΔS > 0 for most spontaneous processes. (ΔH < 0 is not always required)

Test

Q.10 Medium Physical Chemistry

The solubility product of AgCl at 25°C is 1.8 × 10⁻¹⁰. What is the solubility in mol/L?

A 1.34 × 10⁻⁵

B 2.68 × 10⁻⁵

C 4.24 × 10⁻⁵

D 9 × 10⁻⁶

Correct Answer: A. 1.34 × 10⁻⁵

EXPLANATION

For AgCl: Ksp = [Ag⁺][Cl⁻] = s² = 1.8 × 10⁻¹⁰. s = √(1.8 × 10⁻¹⁰) = 1.34 × 10⁻⁵ mol/L

Test

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