Free MCQs & Online Quiz Practice for Exams

Q: When water freezes at 0°C its density decreases due to

A) Change of bond angles

B) Decrease in volume

C) Empty space present in the structure of ice

D) Change of bond length

Q: London dispersion forces are only forces present among which of the following?

A) Polar molecules of water at room temperature

B) Molecules of HF at room temperature

C) Molecules of solid iodine at room temperature

D) Molecules of hydrogen chloride gas at room temperature

Q: Molar heat of vaporization of water is

A) 40.7 kJ/mol

B) 40.7 J/mol

C) 40.7 cal·mol

D) 40.7 cal·mol

Q: The S.I. unit of viscosity is

A) kg·m·s⁻¹

B) kg·m·s⁻¹

C) kg·m·s

D) kg·m⁻¹·s⁻¹

Q: Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it?

A) Liquid is incompressible

B) Liquid does not have definite volume

C) Liquid is highly compressible

D) Liquid molecules can slide over each other

Q: Hydrogen bonding is not involved in

A) DNA structure

B) The liquid properties of water

C) Liquid HF

D) Liquid CH₄

Q: Which one is incorrect for evaporation

A) Surface phenomenon

B) Continuous process

C) Exothermic process

D) Causes cooling

Q: Exceptionally low acidic strength of HF is due to

A) Strong polar bond

B) Small size of fluorine

C) Strong hydrogen bonding

D) Van der Waals forces

Q: Distillation under very reduced pressure is

A) Vacuum distillation

B) Steam distillation

C) Destructive distillation

D) Fractional distillation

Q: Which one of the following is more temperature sensitive

A) Ionic crystals

B) Solid crystals

C) Liquid crystals

D) Molecular crystals

Q: Which of the following has weakest London dispersion forces

A) F₂

B) Cl₂

C) Br₂

D) I₂

Q: What is the boiling point of water at a mountain?

A) It is 100°C

B) It is < 100°C, since the atmospheric pressure is greater

C) It is > 100°C, since the atmospheric pressure is greater

D) It is < 100°C, since the atmospheric pressure is less

Q: The crystal of ice is an example of

A) Metallic solid

B) Molecular solid

C) Covalent solid

D) Ionic solid

Q: KNO₃ and NaNO₃ both have the atomic ratio 1:1:3 in their crystals. This property is called

A) Isotropy

B) Anisotropy

C) Isomorphism

D) Polymorphism

Q: The number of centre(s) of symmetry of a cubic crystal is/are

A) One

B) Two

C) Three

D) Six

Q: A pair of compounds which are isomorphic in nature is

A) NaCl and KNO₃

B) MgO and ZnO

C) NaNO₃ and CdS

D) NaF and CaCO₃

Q: Crystals show variation in physical properties depending upon the direction. The property is called

A) Isomorphism

B) Isotropy

C) Anisotropy

D) Polymorphism

Q: The parameters of unit cell is

A) 4

B) 5

C) 6

D) 7

Q: Sodium chloride (NaCl) on crystallization forms the

A) Face-centred cubic lattice (FCC lattice)

B) Orthorhombic lattice

C) Body-centred cubic lattice

D) Simple cubic lattice

Q: The molecules of CO₂ in dry ice form the

A) Ionic crystals

B) Covalent crystals

C) Molecular crystals

D) Metallic crystals