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Chemistry 1991 JAMB Past Questions

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1
Which of the following can be obtained by fractional distillation?
  • A. Nitrogen from liquid air
  • B. Sodium chloride from sea water
  • C. Iodine from a solution of Iondine in carbon tetrachloride
  • D. Sulphur from a solution of sulphur incarbon disulphide
View Answer & Discuss (2) JAMB 1991
2
Which of the following are mixtures?
i, Petroleum
ii, Rubber latex
iii. Vulcanizer's solution
iv, Carbon (II)sulphide
  • A. i, ii and iii
  • B. i, ii and iv
  • C. i and ii only
  • D. i and iv
View Answer & Discuss (2) JAMB 1991
3
An iron ore is known to contain 70.0% Fe2O3. The obtain from 80kg of the ore is?

(Fe = 56, O = 16)
  • A. 35.0 kg
  • B. 39.2 kg
  • C. 70.0 kg
  • D. 78.4 kg
View Answer & Discuss (18) JAMB 1991
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4
In two separate experiments, 0.36g and 0.71g of chlorine combined with a metal X to give Y and Z respectively. An analysis showed that Y and Z contain 0.20g and 0.40g of X respectively. The data above represents the law of ?
  • A. multiple proportion
  • B. conservation of mass
  • C. constant composition
  • D. reciprocal proportion
View Answer & Discuss (21) JAMB 1991
5

30cm\(^3\) of oxygen at 10 atmospheres pressure is placed in a 20 cm\(^3\) container. Calculate the new pressure if temperature is kept constant?

  • A. 6.7 atm
  • B. 15.0 atm
  • C. 60.0 atm
  • D. 66. 0 atm
View Answer & Discuss (6) JAMB 1991
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