Jamb Chemistry 1994 Past Questions and Answers

Question 6:

• JAMB 1994

For a gas, the relative molecular mass is equal to 2Y. What is Y?

A. The mas of the gas
B. The vapour density of the gas
C. The volume of the gas
D. The temperature of the gas

Question 7:

• JAMB 1994

The densities of two gases, X and Y, are 0.5 g dm^-3 and 2.0 dm^-3 respectively.
What is the rate of diffusion of X relative to Y?

A. 0.1
B. 0.5
C. 2.0
D. 4.0

Question 8:

• JAMB 1994

The shape of ammonia molecule is?

A. Trigonal planar
B. Octahedral
C. Square planar
D. Tetrahedral

Question 9:

• JAMB 1994

An increase in temperature causes an increase in the pressure of a gas because?

A. It decreases the number of collision between the molecules
B. The molecules of the gas bombard the walls of the container more frequently
C. It increases the number of collision between the molecules
D. It causes the molecules to combine

Question 10:

• JAMB 1994

The number of electrons in the valence shell of an element of atomic number 14 is?

A. 1
B. 2
C. 3
D. 4