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Chemistry Past Questions

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646

A solid X when heated gives off a brown gas. If X is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then X is

  • A. basic lead carbonate
  • B. lead (II) nitrate
  • C. sodium carbonate
  • D. zinc nitrate
  • E. sodium nitrate
View Answer & Discuss (7) JAMB 1978
647

Consider the solubility curves of three salts X, Y and Z given in the diagram. If each solution of the salt contains 200 g, and is heated to 100\(^o\)C, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0\(^o\)C?

  • A. X only
  • B. Y only
  • C. Z only
  • D. X and Z
  • E. Y and Z
View Answer & Discuss (21) JAMB 1978
648

An experiment test of the Law of conservation of Mass is illustrated in the diagram. In practice, the flask is weighed before and after reaction between solutions X and Y. Which of the following pairs of solutions will be unsuitable for the experiments

  • A. X = hydrochloric acid; Y = silver nitrate
  • B. X = barium chloride; Y = dilute sulphuric acid
  • C. X = hydrochloric acid; Y = sodium hydroxide
  • D. X = hydrochloric acid; Y = lead nitrate
  • E. X = hydrochloric acid; Y = sodium carbonate
View Answer & Discuss (17) JAMB 1978
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649
Five compounds R,T,W,X and Y form the following compounds: a basic hydride R.H, an acidic hydride YH, atmospheric oxide W2O3, XO2. which of the elements is an alkali
  • A. R
  • B. T
  • C. W
  • D. X
  • E. Y
View Answer & Discuss (7) JAMB 1978
650

The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?

  • A. R
  • B. T
  • C. W
  • D. X
  • E. Y
View Answer & Discuss (16) JAMB 1978
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