Jamb Chemistry Past Questions and Answers

Question 106:

• JAMB 1978

Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?

A. T
B. W
C. X
D. Y
E. Z

Question 107:

• JAMB 1978

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

Question 108:

• JAMB 1978

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^oC, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0^oC?

A. X only
B. Y only
C. Z only
D. X and Z
E. Y and Z

Question 109:

• JAMB 1978

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

Question 110:

• JAMB 1978

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