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Chemistry JAMB Past Questions

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1126
A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is?
  • A. NaHS
  • B. Na2SO3
  • C. Na2S
  • D. NaHSO3
View Answer & Discuss (13) JAMB 1986
1127
Ammonia gas is normally dried with?
  • A. concentrated sulphuric acid
  • B. quicklime
  • C. anhydrous calcium chloride
  • D. magnesium sulphate
View Answer & Discuss (2) JAMB 1986
1128
What are the values of x, y and z respectively in the equation: xCu + yHNO3 → xCu(NO3)2 + 4H2O + zNO?
  • A. 4: 1: 2
  • B. 3:8:2
  • C. 2:8:3
  • D. 8:3:2
View Answer & Discuss (7) JAMB 1986
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1129
The iron (III) oxide impurity in bauxite can be removed by?
  • A. Fractional crystallization in acid solution
  • B. dissolution in sodium hydroxide and filtration
  • C. extraction with concentrated ammonia and reprecipitation
  • D. electroysis of molten mixture
View Answer & Discuss (15) JAMB 1986
1130

Which of the following does NOT contain aluminium as component?

  • A. Over-head cables
  • B. Duralumin
  • C. Container for caustic soda
  • D. Container for nitric acid
View Answer & Discuss (24) JAMB 1986
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