Jamb Chemistry Past Questions and Answers

Question 231:

• JAMB 1981

When sodium nitrate dissolves in water, ∆H is positive. This means that?

A. The reaction is catalysed
B. The reaction is complete
C. The reaction is exothermic
D. The reaction is endthermic
E. Sodium nitrate is highly soluble in water

Question 232:

• JAMB 1981

If an organic compound decolorizes bromine water then the compound is?

A. Saturated
B. Supersaturated
C. Unsaturated
D. A solid
E. Protonated

Question 233:

• JAMB 1981

When air is compressed?

A. Its density decreases
B. It solidifies
C. Its temperature decreases
D. Its temperature increases
E. Its temperature remains unchanged

Question 234:

• JAMB 1981

Fats and oils are?

A. Addition products of long chain fatty acids and alkali
B. Addition products of long-chain fattyy acids and glycerol
C. Condensation products of long-chain fatty acids and glycerol
D. Condensation products of formaldehyde and glycerol
E. Liquids at 20°C

Question 235:

• JAMB 1981

Which of the following statements about phosphorus is NOT correct?

A. Phosphorus is a solid mineral
B. Phosphorus is obtained by oxidation reaction of phosphate
C. Phosphorus exists in two allotropic forms
D. Both forms of phosphorus are interconvertible
E. Yellow phosporus ignites when rubbed on a rough surface