An ideal gas undergoes isothermal compression from 10 L to 5 L at constant temperature. The work done ON the gas is:

The correct answer is A: Positive. In compression, volume decreases and work is done ON the gas, making w positive (in physics convention). W = -nRT ln(Vf/Vi) where Vf < Vi

A buffer solution is prepared by mixing 100 mL of 0.1 M CH₃COOH and 100 mL of 0.1 M CH₃COONa. The pKa of acetic acid is 4.74. What is the pH?

The correct answer is B: 4.74. Using Henderson-Hasselbalch: pH = pKa + log([A⁻]/[HA]) = 4.74 + log(0.1/0.1) = 4.74

What is the pH of a 0.01 M HCl solution?

The correct answer is B: 2. HCl is a strong acid and completely dissociates. [H⁺] = 0.01 M = 10⁻² M. Therefore, pH = -log[H⁺] = -log(10⁻²) = 2.

For the reaction: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), if initial pressure of PCl₅ is 1 atm and degree of dissociation is 0.4, what is Kp at constant total pressure?

The correct answer is A: 0.267 atm. Initial: PCl₅ = 1 atm. At equilibrium with α = 0.4: PCl₅ = 0.6, PCl₃ = 0.4, Cl₂ = 0.4 atm. Kp = (0.4 × 0.4)/(0.6) = 0.267 atm

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NEET Chemistry

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

31 Q 1 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–10 of 31

Topics in NEET Chemistry

All Physical Chemistry 88

Q.1 Easy Physical Chemistry

In the Nernst equation at 25°C, what is the value of (2.303RT/F)?

A 0.026 V

B 0.059 V

C 0.0592 V

D 0.12 V

Correct Answer: C. 0.0592 V

EXPLANATION

At 25°C (298 K), (2.303RT/F) = (2.303 × 8.314 × 298)/96485 ≈ 0.0592 V. This is commonly used in half-cell potential calculations.

Test

Q.2 Easy Physical Chemistry

Which colligative property is independent of the nature of the solute?

A Boiling point elevation

B Freezing point depression

C Osmotic pressure

D All of the above

Correct Answer: D. All of the above

EXPLANATION

All colligative properties (boiling point elevation, freezing point depression, osmotic pressure, and vapor pressure lowering) depend only on the number of solute particles, not their nature.

Test

Q.3 Easy Physical Chemistry

In a galvanic cell, which statement is always true?

A Oxidation occurs at the cathode

B Reduction occurs at the anode

C Electrons flow from cathode to anode through external circuit

D The anode is always the negative electrode

Correct Answer: D. The anode is always the negative electrode

EXPLANATION

In a galvanic cell, the anode is where oxidation occurs and is the negative electrode. Electrons flow from anode to cathode through the external circuit.

Test

Q.4 Easy Physical Chemistry

A solution has [H⁺] = 10⁻⁴ M at 25°C. What is the pH and pOH of this solution?

A pH = 4, pOH = 10

B pH = 10, pOH = 4

C pH = 4, pOH = 14

D pH = -4, pOH = 18

Correct Answer: A. pH = 4, pOH = 10

EXPLANATION

pH = -log[H⁺] = -log(10⁻⁴) = 4. At 25°C, pH + pOH = 14, so pOH = 14 - 4 = 10.

Test

Q.5 Easy Physical Chemistry

Which of the following factors does NOT affect the position of chemical equilibrium?

A Temperature

B Pressure (for gaseous systems)

C Presence of a catalyst

D Concentration of reactants

Correct Answer: C. Presence of a catalyst

EXPLANATION

A catalyst speeds up both forward and reverse reactions equally, so it does not change the position of equilibrium. It only helps the system reach equilibrium faster.

Test

Q.6 Easy Physical Chemistry

When 50 mL of 0.1 M HCl is mixed with 50 mL of 0.1 M NaOH, the resulting solution will have:

A pH = 7

B pH < 7

C pH > 7

D pH = 14

Correct Answer: A. pH = 7

EXPLANATION

Equivalent moles of strong acid and strong base neutralize completely. The salt NaCl formed doesn't hydrolyze. pH = 7

Test

Q.7 Easy Physical Chemistry

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

A 0.5 min

B 1 min

C 2 min

D 1.386 min

Correct Answer: B. 1 min

EXPLANATION

For first-order reaction: t₁/₂ = 0.693/k = 0.693/0.693 = 1 min

Test

Q.8 Easy Physical Chemistry

At 273 K, 1 mole of an ideal gas occupies 22.4 L. What will be its volume at 546 K and same pressure?

A 22.4 L

B 44.8 L

C 11.2 L

D 89.6 L

Correct Answer: B. 44.8 L

EXPLANATION

Using Charles's Law: V₁/T₁ = V₂/T₂ → V₂ = V₁ × (T₂/T₁) = 22.4 × (546/273) = 44.8 L

Test

Q.9 Easy Physical Chemistry

Which electrochemical cell cannot be recharged?

A Lead-acid cell

B Daniell cell

C Nickel-cadmium cell

D Lithium-ion cell

Correct Answer: B. Daniell cell

EXPLANATION

Daniell cell is a primary cell (non-rechargeable). Others are secondary (rechargeable) cells.

Test

Q.10 Easy Physical Chemistry

For the reaction: N₂O₄(g) ⇌ 2NO₂(g), ΔH = 58 kJ/mol. If pressure is increased at constant temperature, the equilibrium will:

A Shift to the right

B Shift to the left

C Remain unaffected

D First shift right then left

Correct Answer: B. Shift to the left

EXPLANATION

Increasing pressure favors the side with fewer moles of gas. 1 mole N₂O₄ ⇌ 2 moles NO₂. Equilibrium shifts left.

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