Jamb Chemistry 1986 Past Questions and Answers

Question 36:

• JAMB 1986

The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as?

A. Brownian movement
B. Condensation
C. Evaporation
D. Liquefaction

Question 37:

• JAMB 1986

What mass of a divalent metal M (atomic mass = 40) would react with excess hydrogen gas measured at S.T.P?

A. 8.0 g
B. 4.0 g
C. 0.8 g
D. 0.4 g

Question 38:

• 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 39:

• JAMB 1986

In the electrolysis of aqueous solution of K₂SO ₄ in the above cell, which species migrate to the anode?

A. SO^2-OH ^-
B. K ⁺ and SO ₄^2-
C. OH and HO
D. H₃O ⁺ and K

Question 40:

• JAMB 1986

The tabulated results below were obtained by titration 10.0 cm₃ of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is

A. 1.5
B. 1.4
C. 4.1
D. 5.1