For a reaction with mechanism: A ⇌ B (fast equilibrium), B + C → D (slow), the rate law is:

The correct answer is C: rate = k[A]^(1/2)[C]. From fast equilibrium: K = [B]/[A], so [B] = K[A]. The slow step rate law is rate = k'[B][C] = k'K[A][C] = k[A]^(1/2)[C] where k combines constants.

Which of the following compounds would exhibit hydrogen bonding?

The correct answer is B: HF. HF exhibits hydrogen bonding between H (bonded to highly electronegative F) and lone pairs on F of adjacent molecules.

A weak acid HA has Ka = 1.8 × 10⁻⁵. What is the pH of a 0.2 M solution of HA?

The correct answer is B: 2.98. For weak acids: [H⁺] = √(Ka × C) = √(1.8 × 10⁻⁵ × 0.2) = √(3.6 × 10⁻⁶) ≈ 1.9 × 10⁻³. pH = -log(1.9 × 10⁻³) ≈ 2.72 ≈ 2.98

Which of the following noble gases has the lowest ionization energy?

The correct answer is D: Xenon. Ionization energy decreases down a group. Xenon (54 electrons) has the largest atomic radius and lowest ionization energy among noble gases listed.

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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 11–20 of 31

Topics in JEE Chemistry

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

Q.11 Easy Physical Chemistry

For a galvanic cell: Cu²⁺ + 2e⁻ → Cu (E° = 0.34 V) and Zn²⁺ + 2e⁻ → Zn (E° = -0.76 V). What is the standard cell potential (E°cell)?

A 1.10 V

B 0.42 V

C -1.10 V

D 1.56 V

Correct Answer: A. 1.10 V

EXPLANATION

E°cell = E°cathode - E°anode = 0.34 - (-0.76) = 1.10 V. Cu is cathode (reduction), Zn is anode (oxidation).

Test

Q.12 Easy Physical Chemistry

For the complex ion [Cu(NH₃)₄]²⁺, what is the coordination number of Cu²⁺?

A 2

B 4

C 6

D 8

Correct Answer: B. 4

EXPLANATION

The coordination number is the number of ligands attached to the central metal ion. Here, 4 NH₃ ligands are bonded to Cu²⁺, so coordination number = 4.

Test

Q.13 Easy Physical Chemistry

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

A 1

B 2

C 3

D 4

Correct Answer: C. 3

EXPLANATION

Overall order = sum of exponents in rate law = 2 + 1 = 3 (third-order reaction). Note: order is determined experimentally, not from stoichiometry.

Test

Q.14 Easy Physical Chemistry

A solution has [OH⁻] = 1.0 × 10⁻⁸ M at 25°C. Is this solution acidic, basic, or neutral?

A Acidic

B Basic

C Neutral

D Cannot be determined

Correct Answer: A. Acidic

EXPLANATION

pOH = -log(1.0 × 10⁻⁸) = 8, so pH = 14 - 8 = 6. Since pH < 7, the solution is acidic.

Test

Q.15 Easy Physical Chemistry

For a spontaneous process at constant temperature and pressure, which relationship is always true?

A ΔG > 0

B ΔG < 0

C ΔH < 0

D ΔS > 0

Correct Answer: B. ΔG < 0

EXPLANATION

For spontaneous processes, ΔG must be negative (ΔG < 0) at constant T and P. This is the fundamental criterion for spontaneity.

Test

Q.16 Easy Physical Chemistry

Which of the following factors does NOT affect the rate of a chemical reaction?

A Temperature

B Pressure

C Color of the reaction vessel

D Concentration of reactants

Correct Answer: C. Color of the reaction vessel

EXPLANATION

The color of the reaction vessel is irrelevant to reaction rate. Temperature, pressure, and concentration are major factors affecting reaction kinetics.

Test

Q.17 Easy Physical Chemistry

At 25°C, the ionic product of water (Kw) is 1.0 × 10⁻¹⁴. What is the pH of a solution where [H⁺] = 2.5 × 10⁻⁵ M?

A 4.60

B 9.40

C 3.85

D 5.15

Correct Answer: A. 4.60

EXPLANATION

pH = -log[H⁺] = -log(2.5 × 10⁻⁵) = 4.60

Test

Q.18 Easy Physical Chemistry

For a galvanic cell, which statement is true?

A Anode is positive, cathode is negative

B Oxidation occurs at cathode

C Electrons flow from anode to cathode through external circuit

D Standard cell potential is always negative

Correct Answer: C. Electrons flow from anode to cathode through external circuit

EXPLANATION

In a galvanic cell, anode is negative, cathode is positive. Oxidation occurs at anode. Electrons flow from anode to cathode.

Test

Q.19 Easy Physical Chemistry

Which of the following represents the correct relationship between Qc and Kc for a reaction at non-equilibrium?

A If Qc > Kc, reaction proceeds forward

B If Qc < Kc, reaction proceeds in reverse

C If Qc = Kc, reaction is at equilibrium

D Qc and Kc are always equal

Correct Answer: C. If Qc = Kc, reaction is at equilibrium

EXPLANATION

Qc = Kc indicates equilibrium. If Qc > Kc, reaction shifts backward; if Qc < Kc, reaction shifts forward.

Test

Q.20 Easy Physical Chemistry

Which statement about entropy is correct?

A Entropy always decreases in a spontaneous process

B Entropy of an isolated system always increases or remains constant

C Entropy of a perfect crystal at 0 K is positive

D Entropy decreases with increase in temperature

Correct Answer: B. Entropy of an isolated system always increases or remains constant

EXPLANATION

According to the second law of thermodynamics, entropy of an isolated system increases or remains constant (ΔSuniverse ≥ 0).

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