Chemistry 1992 Jamb Past Questions and Answers

Question 46 :

• JAMB 1992

Alkanals can be differentiated from alkanones by reaction with?

A. 2,4-dinitrophenylhydrazine
B. Hydrogen cyanide
C. Sodium hydrogen sulphite
D. Tollen's reagent

Question 47 :

• JAMB 1992

An example of a polysaccharides is?

A. —dextrose
B. Mannose
C. Glucose
D. Starch

Question 48 :

• JAMB 1992

In the experiment above. Z can be

A. A solution of sodium dioxonitrate (lll) and ammonium chloride
B. A solution of lead trioxnitrate (V)
C. A solution of sodium trioxonitrate (V) and ammonium chloride
D. Concentrated tetraoxosulphate (VI) acid and sodium trioxonitrate (V)

Question 49 :

• JAMB 1992

Which of the following compounds is a secondary alkanol?

A. A
B. B
C. C
D. D

Question 50 :

• JAMB 1992

A given mass of gas occupies 2 dm² at 300k. At what temperature will its volume be doubled keeping the pressure constant?

A. 400k
B. 480k
C. 550k
D. 600k