Free MCQs & Online Quiz Practice for Exams

Q: In Carbon dioxide (CO₂) molecule, the number of sigma covalent bond(s) is/are

A) 1

B) 2

C) 3

D) 4

Q: H₂S has a net dipole moment while BeF₂ has zero dipole moment, because

A) H₂S molecule is linear while BeF₂ is angular

B) H₂S molecule is angular, while BeF₂ molecule is linear

C) Fluorine has more electronegativity than S

D) Be is more electronegative than S

Q: Which one has the least bond angle

A) NH₃

B) H₂O

C) CH₄

D) BF₃

Q: The unhybridized p orbital in sp² hybridization is

A) Parallel to sp

B) In the same plane

C) Perpendicular to sp² orbitals

D) Out of plane

Q: If absolute temperature of a gas is doubled and the pressure is reduced to one-half the volume of gas will

A) remain unchanged

B) double

C) reduce to half

D) increase four times

Q: One dm³ of Hydrogen at STP weighs approximately

A) 0.0789 g

B) 0.0799 g

C) 0.0987 g

D) 0.0899 g

Q: In a factory producing liquid air, one of the pipes carrying dry air at −80°C is blocked with a white solid. This white solid is

A) Argon

B) Ice

C) Nitrogen

D) Carbon dioxide

Q: The spreading of perfume or scent in air is due to

A) Diffusion

B) Effusion

C) Attraction with air

D) Low density

Q: A gas has certain volume at 10°C. How much temperature should be raised to double its volume?

A) 566 K

B) 283 K

C) 293 K

D) 283°C

Q: The rate of diffusion of hydrogen (H₂) compared with helium (He) is

A) 0.5 times

B) 1.4 times

C) 2 times

D) 4 times

Q: The non-ideal behaviour results chiefly from

A) Intermolecular attraction and infinite volume

B) Elastic collisions and finite volume

C) Intermolecular attractions and finite volume

D) Intermolecular attraction only

Q: The molar volume of helium (He) is 44.8 dm³ at

A) 100°C and 1 atm

B) 25°C and 0.25 atm

C) 0°C and 0.5 atm

D) 40°C and 0.5 atm

Q: Which statement about the behaviour of the particles in a gas is NOT correct

A) They are able to move at great speeds

B) The forces of attraction between the particles are negligible

C) There is large space among the particles

D) They are arranged in regular patterns

Q: At the same temperature and pressure which of the following gases has greatest density

A) CO₂

B) SO₂

C) Cl₂

D) H₂O

Q: Weight of one dm³ of O₂ at STP is

A) 1.4384 g

B) 1.5394 g

C) 1.6384 g

D) 1.3384 g

Q: The value of ideal gas constant in dm³·torr·K⁻¹·mol⁻¹ is

A) 0.0821

B) 1.98722

C) 62.364

D) 8.3143

Q: 760 torr is equal to

A) 760 Pascal

B) 76 Pascal

C) 101325 Pascal

D) 1.01325 Pascal

Q: At 50°C a gas has 1 atm pressure, and 20 dm³ volume; its volume at STP would be

A) 16.94 dm³

B) 10.92 dm³

C) 3.66 dm³

D) 42.2 dm³

Q: Which of the following gases will have the fastest effusion rate?

A) CH₄

B) NH₃

C) CO₂

D) O₂

Q: Forces of attraction which may be present between atoms of molecules are

A) Intramolecular

B) Intermolecular

C) Van der Waals

D) Dipole-induced dipole