Solubility - Jamb Chemistry Past Questions and Answers

Question 31:

• JAMB 1985

Hydrogen diffuses through a porous plug

A. At the same rate as oxygen
B. At a slower rate than oxygen
C. Twice as fast as oxygen
D. Three times as fast as oxygen
E. Four times as fast as oxygen

Question 32:

• JAMB 1986

Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?

A. KCI
B. NaNO₃
C. K₂SO₄
D. CaSO₄

Question 33:

• JAMB 1986

What reaction takes place when palm-oil is added to potash and foam are observed?

A. Neutralization
B. Saponification
C. Esterification
D. Salting-out

Question 34:

• JAMB 1986

In the solubility curve above, water at 98^oC is saturated with KCL and KCIO ₃ What is the percentage of KCL impurity in the crystals formed when the solution is cooled to 30 ^oC?

A. 51.5
B. 45.5
C. 34.5
D. 26.5

Question 35:

• JAMB 1988

A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?

A. S dissolves in the solution
B. Crystals of R are precipitated
C. There is no observable change
D. R and S react to generate heat