The relationship between equivalent conductance (Λ) and molar conductance (Λm) is:

The correct answer is A: Λ = Λm × n. Λm = κ × 1000/c (molar conductance), Λ = κ × 1000/(c/n) (equivalent conductance). Therefore, Λm = Λ/n or Λ = Λm × n.

In the conversion of benzene to benzoic acid through the Kolbe reaction, the carboxylic acid is ultimately derived from:

The correct answer is B: CO2 fixation on the aromatic ring. In the Kolbe carboxylation of phenols, CO2 is directly incorporated into the aromatic ring ortho to the hydroxyl group under high temperature and pressure with alkali, forming salicylic acid derivatives.

In the hydroboration-oxidation of alkenes, the reaction is stereospecific because:

The correct answer is B: It proceeds through a four-membered ring transition state with syn-addition. Hydroboration occurs through a concerted mechanism involving a four-membered ring transition state, resulting in syn-addition of BH across the double bond.

In the oxidation of primary alcohols using K2Cr2O7/H2SO4, the final product is:

The correct answer is B: A carboxylic acid. K2Cr2O7 in acidic medium is a strong oxidizing agent that oxidizes primary alcohols first to aldehydes, then further oxidizes the aldehyde to carboxylic acids.

In electrochemistry, overpotential is important because:

The correct answer is B: It is the excess potential required beyond E° to drive an electrode reaction at appreciable rates. Overpotential (η) is the excess potential needed to overcome kinetic barriers and drive the reaction at significant rates. It depends on current density and the nature of the electrode.

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Inorganic Chemistry

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

49 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–20 of 49

Topics in JEE Chemistry

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

Q.11 Medium Inorganic Chemistry

The magnetic moment of [Fe(H₂O)₆]²⁺ complex is approximately:

A 0 BM

B 2.84 BM

C 4.90 BM

D 5.92 BM

Correct Answer: D. 5.92 BM

EXPLANATION

Fe²⁺ has d⁶ configuration. In octahedral geometry with weak field ligand H₂O, it remains high spin with 4 unpaired electrons giving μ = √[4(4+2)] ≈ 4.90 BM, but aqua complex shows ~5.92 BM.

Test

Q.12 Medium Inorganic Chemistry

Which transition metal forms a complex with CO that has maximum carbonyl stretching frequency?

A Fe

B Ni

C Mn

D Co

Correct Answer: C. Mn

EXPLANATION

Manganese with lower electron density shows weaker back-bonding, resulting in higher CO stretching frequency. The order is Mn > Co > Fe > Ni based on back-bonding strength.

Test

Q.13 Medium Inorganic Chemistry

Which of the following elements forms the most stable +6 oxidation state in its compounds?

A Chromium

B Molybdenum

C Tungsten

D Vanadium

Correct Answer: C. Tungsten

EXPLANATION

Tungsten forms the most stable +6 oxidation state compounds like WO₃ and WCl₆. The stability of +6 state decreases from W to Mo to Cr due to increasing ease of reduction.

Test

Q.14 Medium Inorganic Chemistry

Which of the following factors does NOT affect the magnitude of crystal field splitting (Δ)?

A Nature of ligand (weak or strong field)

B Oxidation state of central metal ion

C Mass of the central metal ion

D Geometry of the complex

Correct Answer: C. Mass of the central metal ion

EXPLANATION

Crystal field splitting depends on ligand strength, metal ion charge, and geometry, but NOT on the mass of the metal ion.

Test

Q.15 Medium Inorganic Chemistry

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

A +4 to +3

B +4 to +2

C +6 to +4

D +2 to +4

Correct Answer: B. +4 to +2

EXPLANATION

MnO₂ (Mn⁴⁺) acts as oxidizing agent, reducing Cl⁻ to Cl₂. Mn⁴⁺ gains 2 electrons, reducing to Mn²⁺.

Test

Q.16 Medium Inorganic Chemistry

The complex [Ni(CN)₄]²⁻ is diamagnetic. This indicates:

A Ni is in +3 oxidation state

B The complex has square planar geometry

C CN⁻ is a weak field ligand

D The complex is unstable

Correct Answer: B. The complex has square planar geometry

EXPLANATION

Ni²⁺ with strong field CN⁻ ligands shows diamagnetism (d⁸ with all paired electrons) in square planar geometry (dsp² hybridization).

Test

Q.17 Medium Inorganic Chemistry

Which of the following statements about diborane (B₂H₆) is incorrect?

A It has 3-center-2-electron bonds

B It is a strong reducing agent

C It has a planar structure

D It is an electron-deficient compound

Correct Answer: C. It has a planar structure

EXPLANATION

B₂H₆ has a bridged structure with 3D geometry, not planar. It contains bridging hydrogens forming 3-center-2-electron bonds.

Test

Q.18 Medium Inorganic Chemistry

The geometry of [PdCl₄]²⁻ complex is:

A Tetrahedral

B Square planar

C Octahedral

D Trigonal bipyramidal

Correct Answer: B. Square planar

EXPLANATION

Pd²⁺ is d⁸ with strong field preference. It forms square planar geometry with Cl⁻ (weak field ligand) due to crystal field stabilization.

Test

Q.19 Medium Inorganic Chemistry

The solubility product of AgCl at 25°C is 1.8 × 10⁻¹⁰. In 0.1 M NaCl solution, the concentration of Ag⁺ will be:

A 1.8 × 10⁻⁹ M

B 1.8 × 10⁻¹⁰ M

C 1.8 × 10⁻⁸ M

D 1.34 × 10⁻⁵ M

Correct Answer: A. 1.8 × 10⁻⁹ M

EXPLANATION

Ksp = [Ag⁺][Cl⁻] = 1.8 × 10⁻¹⁰. With [Cl⁻] = 0.1 M, [Ag⁺] = Ksp/[Cl⁻] = 1.8 × 10⁻¹⁰/0.1 = 1.8 × 10⁻⁹ M

Test

Q.20 Medium Inorganic Chemistry

Which of the following lanthanides has the configuration [Xe]4f⁷6s²?

A Europium

B Gadolinium

C Terbium

D Samarium

Correct Answer: A. Europium

EXPLANATION

Europium (Eu) has atomic number 63 and configuration [Xe]4f⁷6s², with a half-filled f-orbital making it particularly stable.

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