MCQ on Acid base/ van der Waals Equation/ Gaseous - Liquid - Solid States

This are questions from Acids and bases - Past JEE questions,van der Waals Equation - past JEE questions, Gaseous - Liquid - Solid States- Multiple Choice Questions

1. State whether the following statement is true or false
Aluminium chloride (AlCl3) is a Lewis acid because it can donate electrons. (1982)

2. Fill in the blanks

The conjugate base of HSO4ˉ in acqueous solution is ___________. (1982)


3. The conjugate acid of NH2ˉ is:
a. NH3
b. NH2OH
c. NH4⁺
d. N2H4

(1985)

3. In the van der Waals equation of state for a non-ideal gas the term that accounts for intermolecular forces is

a. (V-b)
b. RT
c. (P + a/V²)
d. (RT) ‾ ¹
(1988)

Answer ( c )

A is a measure of the forces of attraction between molecules

4. Indicate whether the following statement is true or false

In the van der Waals equation

[p + n²a/V²] (V – nb) = nRT

the constant ‘a’ reflects the actual volume of the gas molecules.

(1993)

Answer: False

5. The oxidation number of carbon in CH2O is

a. -2
b. +2
c. 0
d. +4
(JEE 1982)

Ans: ( c )

6. Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

a. same as that of a hydrogen molecule
b. two times that of a hydrogen molecule
c. four times that of a hydrogen molecule
d. half that of a hydrogen molecule
(JEE 1982)

Answer: (a)

7. among the following, the molecule that is linear is

a. CO2
b. NO2
c. SO2
d. ClO2
(JEE 1982)

ans : (a)

CO2 is a linear molecule


8. A liquid is in equilibrium with its vapour at its boiling point. On average, the molecules in the two phases have equal:

a. inter-molecular forces
b. potential energy
c. kinetic energy
d. temperature
(JEE 1984)

Answer (d)

9. Rate of diffusion of a gas is:

a. directly proportional to its density
b. directly proportional t its molecular weight
c. directly proportional to the square root of its molecular weight
d. indirectly proportional to the square root of its molecular weight
(JEE 1985)

Answer (d)

10. the average velocity of an ideal gas molecule at 27°C is 0.3 m/s. the average speed at 927°C will be:

a. 0.6 m/s
b. 0.3 m/s
c. 0.9 m/s
d. 3.0 m/s
(JEE 1986)

Answer: (a)