Jamb Chemistry Past Questions For Year 1978
Question 1
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 2
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
Question 3
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
Question 4
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 5
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 100oC, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0oC?
- A. X only
- B. Y only
- C. Z only
- D. X and Z
- E. Y and Z
