Chemical combination - Jamb Chemistry Past Questions and Answers

Question 21:

• JAMB 1982

0.07g of a hydride of carbon occupies 56.0cm³ at S.T.P. when vaporized and contains 14.29% by mass of hydrocarbon is(C = 12, H = 1)

A. CH₄
B. C₂H₂
C. C₂H₄
D. C₂H₆
E. C₃H₈

Question 22:

• JAMB 1982

An element X has two isotopes, ²⁰₁₀X and ²⁰₁₀X,
present in the ratio 1:3. The relative atomic mass of X would be?

A. 20.5
B. 21.0
C. 21.5
D. 22.0
E. 22.5

Question 23:

• JAMB 1982

What weight of sodium hydroxide is required to make 500 cm³ of 0.2 M solution?
(Na = 23, O = 16, H = 1)

A. 40 g
B. 20 g
C. 10 g
D. 4 g
E. 2 g

Question 24:

• JAMB 1982

The number of grammes of potassium hydroxide in 250cm³ of one molar solution is?
(K = 39, O = 16, H = 1)

A. 40g
B. 52g
C. 100g
D. 26g
E. 14g

Question 25:

• JAMB 1982

60cm³ of hydrogen are sparked with 20cm³ of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?

A. 60 cm³
B. 10 cm³
C. 40 cm³
D. 30 cm³
E. 70 cm³