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Chemistry 1997 JAMB Past Questions

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1

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%
View Answer & Discuss (8) JAMB 1997
2
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
View Answer & Discuss (15) JAMB 1997
3
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
View Answer & Discuss (4) JAMB 1997
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4
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
View Answer & Discuss (6) JAMB 1997
5
The temperature of a body decreases when drops of liquid placed on it evaporate because?
  • A. the atmospheric vapour pressure has a cooling effect on the body
  • B. a temperature gradient exists between the drops of liquid and the body causing the latter to vaporate
  • C. the heat of vapourization is drawn from the body causing it to cool
  • D. the random motion of the liquid molecules causes a cooling effect on the body
View Answer & Discuss (4) JAMB 1997
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