Jamb Chemistry 1997 Past Questions and Answers

Question 1:

• JAMB 1997

35 cm3 of hydrogen was sparked with 12 cm3 of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?

A. 11%
B. 31%
C. 35%
D. 69%

Question 2:

• JAMB 1997

35 cm3 of hydrogen was sparked with 12 cm3 of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?

A. 11%
B. 31%
C. 35%
D. 69%

Question 3:

• JAMB 1997

2.85g of an oxide of copper gave 2.52g of copper on reduction and 1.90g of another oxide gave 1.52g of copper on reduction. The data above illustrates the law of?

A. Constant composition
B. Conservation of mass
C. Reciprocal proportions
D. Multiple proportions

Question 4:

• JAMB 1997

An element, X, forms a volatile hydride XH₃ with a vapour density of 17.0. The relative atomic mass of X is?
(H = 1)

A. 34.0
B. 31.0
C. 20.0
D. 14.0

Question 5:

• JAMB 1997

A mixture of 0.20 mole of Ar, 0.20 mole of N₂ and 0.30 mole of He exerts a total pressure of 2.1 atm. The partial pressure of He in the mixture is?

A. 0.90 atm
B. 0.80 atm
C. 0.70 atm
D. 0.60 atm