BITSAT Chemistry States Of Matter MCQs

Question: Which of the following represents Gay Lussac's law ?

II. P₁T₂ = P₂T₁

III. P₁V₁ = P₂V₂

Choose the correct option

a) I, II and III

b) II and III

c) I and III

d) I and II

Answer: I and II

Question: At what temperature, the rate of effusion of N₂ would be 1.625 times than that of SO₂ at 50o C ?

a) 110 K

b) 173 K

c) 373 K

d) 273 K

Answer: 373 K

Question: The average kinetic energy of an ideal gas per molecule in SI unit at 25° C will be

a) 6.17 × 10^-21 kJ

b) 6.17 × 10^–21 J

c) 6.17 × 10^–20 J

d) 7.16 × 10^–20 J

Answer: 6.17 × 10^–21 J

Question: In Van der Waal’s equation the constant b is the measure of

a) Repulsive forces between molecules of gas

b) Attractive forces between molecules of gas

c) Volume occupied by gas molecules

d) All of these

Answer: Volume occupied by gas molecules

Question: Increasing order of rms velocities of H₂, O₂, N₂ and HBr is

a) H₂ > O₂ > N₂ > HBr

b) HBr < O₂ < N₂ < H₂

c) H₂ > N₂ < O₂ > HBr

d) HBr > N₂ < O₂ < H₂

Answer: HBr < O₂ < N₂ < H₂

Question: An ideal gas can’t be liquefied because

a) Its critical temperature is always above 0°C

b) Its molecules are relatively smaller in size

c) It solidifies before becoming a liquid

d) Forces operated between its molecules are negligible

Answer: Forces operated between its molecules are negligible

Question: When the temperature is raised, the viscosity of liquid decreases this is because

a) Decreased volume of the solution

b) Increased attraction between molecules

c) Decreased covalent and hydrogen bond forces

d) Increase in temperature increase the average kinetic energy of molecules which overcomes the attractive force between them

Answer: Increased attraction between molecules

Question: At a constant volume the specific heat of a gas is 0.075 and its molecular weight is 40. The gas is:

a) Monoatomic

b) Diatomic

c) Triatomic

d) None of above

Answer: Monoatomic

Question: The cooking time in a pressure cooker is less because :

a) More heat is used

b) High pressure cooks the food

c) The boiling point of water increases in the cooker

d) Heat is uniformly distributed

Answer: The boiling point of water increases in the cooker

Question: Density ratio of O₂ and H₂ is 16:1. The ratio of their r.m.s. velocities will be

a) 4 : 1

b) 1 : 16

c) 1 : 4

d) 16 : 1

Answer: 1 : 4