Jamb Chemistry 1985 Past Questions and Answers

Question 11:

• JAMB 1985

Which of the following is used in the manufacture of bleaching powder?

A. Sulphur dioxide
B. Chlorine
C. Hydrogen tetraoxosulphate (VI)
D. Hydrogen sulphide
E. Nitrogen dioxide

Question 12:

• JAMB 1985

A man suspected of being drunk is made to pass his breath into acidified potassium dichlormate solution. If his breath carries a significant level of ethanol, the final colour of the solution is?

A. Pink
B. Purple
C. Orange
D. Blue-black
E. Green

Question 13:

• JAMB 1985

When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to?

A. Convection currents
B. Small changes
C. Small changes in temperature
D. A chemical reaction between the pollen grain and water
E. The bombardment of the pollen grains by molecules of water

Question 14:

• JAMB 1985

The energy change (ΔH) for the reaction CO(g) + (1)/(2)O_2(g) → is?
(ΔHi(CO) = -110.4 kJ mol^-) (ΔHi(CO₂) = -393 kJ mol^-)

A. -503.7 kJ
B. +503.7kJ
C. -282.9 kJ
D. +282.9 kJ
E. +393.3 kJ

Question 15:

• JAMB 1985

Tetraoxosulphate (IV) ions are finally tested using?

A. Acidified silver nitrate
B. Acidified barium chloride
C. Ime-water
D. Dilute hydrochloric acid
E. Acidified lead nitrate