Jamb Chemistry Past Questions and Answers

Question 1501:

• JAMB 2009

Which of the following is a physical change?

A. Freezing ice cream
B. Dissolving calcium in water
C. Burning kerosene
D. Exposing white phosphorus to air

Question 1502:

• JAMB 2009

The percentage of water of crystallization in ZnSO₄.7H₂O is
[Zn = 65, S = 32, O = 1, H = 1]

A. 33%
B. 44%
C. 55%
D. 87%

Question 1503:

• JAMB 2009

0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 mole of a solution of hydrochloric acid. The volume of gas evolved at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm³]

A. 224cm³
B. 168cm³
C. 112cm³
D. 100cm³

Question 1504:

• JAMB 2009

A gas exerts pressure on its container because

A. The molecules of a gas collide with the walls of the container
B. Some of the molecules are moving faster than others
C. Of the collisions of the molecules with each other
D. Of the mass of the molecules of the gas

Question 1505:

• JAMB 2009

The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are perfectly elastic implies that the

A. Forces of attraction and repulsion are in equilibrium
B. Gaseous molecules can occupy any available space
C. Gaseous molecules will continue their motion indefinitely
D. Gases can be compressed