Chemical combination - Jamb Chemistry Past Questions and Answers

Question 66:

• JAMB 1994

At the same temperature and pressure, 50 cm³ of nitrogen gas contains the same number of molecules as?

A. 25 cm³ of methane
B. 40 cm³ of hydrogen
C. 50 cm³ of ammonia
D. 100 cm³ of chlorine

Question 67:

• JAMB 1994

8g CH₄ occupies 11.2 dm³ at s.t.p. What volume would 22 g of CH₃CH₃ occupy under the same condition?
(C = 12, H = 1)

A. 3.7 dm³
B. 11.2 dm³
C. 22.4 dm³
D. 33.6 dm³

Question 68:

• 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 69:

• 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 70:

• JAMB 1994

20 cm³ of a 2.0 M solution of ethanoic acid was added to excess of 0.05 M sodium hydroxide. The mass of the salt produced is?
(Na = 23, C = 12, O = 16, H = 1)

A. 2.50 g
B. 2.73 g
C. 3.28 g
D. 4.54 g