# Properties of Mixture of Gases - MCQs with Answers

Q1. In a mixture of ideal gases of volume V and temperature T, what is the pressure exerted by each individual gas if it occupies the total volume V alone at temperature T called?

a. individual pressure
b. divided pressure
c. partial pressure
d. total pressure

Q2. A mixture of ideal gases of volume V at temperature T, contains n1 moles of gas A, n2 moles of gas B and n3 moles of gas C. What is a correct formula for partial pressure (pB) of gas B?

a. (pB) = ((1/3)(n1+n2+n3) RT) / V
b.(pB) = ((n1 + n3) RT) / V
c. (pB) = (n2 RT) / V
d. (pB) = (n2(n1 + n3) RT) / V

ANSWER: c. (pB) = (n2 RT) / V

Q3. Dalton's law of partial pressure states that

a. the total pressure of a mixture of ideal gases is equal to the sum of the partial pressures of individual gases divided by number of gases mixed

b. the total pressure of a mixture of ideal gases is equal to the partial pressure of any individual gas in the mixture

c. the total pressure of a mixture of ideal gases is equal to the sum of the partial pressures of individual gases

d. none of the above

ANSWER: c. the total pressure of a mixture of ideal gases is equal to the sum of the partial pressures of individual gases

Q4. What is the partial volume of a gas in a mixture?

a. volume occupied by a single gas alone of a mixture at the same temperature and pressure of the mixture

b. total volume of the mixture at a certain pressure and temperature divided number of gases mixed in the mixture

c. both a. and b.

d. none of the above

ANSWER: a. volume occupied by a single gas alone of a mixture at the same temperature and pressure of the mixture

Q5. The sum of partial volumes of all gases in a mixture is equal to

a. less than the total volume of the mixture
b. the total volume of the mixture
c. more than the total volume of the mixture
d. cannot predict

ANSWER: b. the total volume of the mixture

Q6. A single phase pure substance has following properties p, V, T, S, U, H, F (Helmholtz function) and G (Gibbs function). Any one in these properties may be expressed

a. as a function of the same property
b. as a function of any one other property
c. as a function of any two other properties
d. none of the above