Free MCQs & Online Quiz Practice for Exams

Q: The nature of bonds between atoms in graphite is

A) Ionic crystal

B) Covalent crystal

C) Molecular crystal

D) Metallic crystal

Q: Which of the following is an example of a metallic solid?

A) C

B) B

C) Si

D) Wolfram

Q: In solid state, the crystals which are good conductors of heat and electricity are

A) Covalent crystals

B) Ionic crystals

C) Molecular crystals

D) Metallic crystals

Q: When a crystalline substance conducts current in one direction but not through other directions of the crystal, this property is called

A) Anisotropy

B) Isotropy

C) Allotropy

D) Isomorphism

Q: Crystals of the same substance can co-exist in equilibrium with each other at the

A) Boiling point

B) Melting point

C) Transition temperature

D) Heat of fusion

Q: A crystal lattice is an arrangement of particles in

A) Four dimensions

B) Three dimensions

C) Two dimensions

D) One dimension

Q: In which of the following values of Kc the reaction goes to completion?

A) 10²

B) 10³⁰

C) 10⁻³⁰

D) 1

Q: An appreciable amount of the products and reactants is present in a reaction if its equilibrium constant value is

A) Negative and large

B) Negative and small

C) Zero

D) Neither large nor small

Q: For N₂ + 3H₂ ⇌ 2NH₃, the optimum temperature for the production of ammonia is

A) 5000 °C

B) 450 °C

C) 0 °C

D) Constant temperature

Q: In the production of SO₃ from SO₂ and O₂, the yield of SO₃ is increased by

A) Increasing temperature

B) Adding a catalyst

C) Adding more SO₂

D) Removing O₂

Q: Le-Chatelier's principle applies to

A) Mechanical systems

B) Physical systems

C) Chemical systems

D) Both physical and chemical systems

Q: The unit of Kc for the system PCl₅ ⇌ PCl₃ + Cl₂ is

A) mol²·dm⁻⁶

B) dm³·mol⁻¹

C) mol·dm⁻⁶

D) mol·dm⁻³

Q: Forward reaction goes virtually to completion when Kc is

A) Positive and small

B) Positive and large

C) Negative and large

D) Unity

Q: Endothermic reactions are favoured in the forward direction by

A) Cooling

B) Freezing

C) Heating

D) Adding a catalyst

Q: Molecules of chlorine decompose to a very small extent into atomic chlorine because Kc of this reaction is

A) Very large

B) Very small

C) Zero

D) One

Q: How much of the reaction is complete when KC = 1 for the system A + B ⇌ C + D?

A) 10%

B) 25%

C) 50%

D) 100%

Q: HCl when added to H₂S solution

A) Suppresses the ionization of H₂S

B) Enhances the ionization of H₂S

C) Solution becomes coloured

D) Does not affect ionization

Q: The value of Kp is greater than Kc when the difference in moles of products and reactants (Δn) is

A) Zero

B) Positive

C) Negative

D) One

Q: Which one is the example of a buffer?

A) HCl / NaCl

B) NaOH / H₂ ₃CO₃

C) NH₄OH / NH₄Cl

D) NaOH / NaCl

Q: A conjugate acid–base pair differs by

A) A proton

B) A proton pair

C) An electron

D) An electron pair