Chemistry 1994 Waec Past Questions and Answers

Question 16 :

• WAEC 1994

Which of the following occurs when an aqueous solution of sodium hydroxide is electrolysed using graphite electrodes?

A. Sodium metal is produced at the anode
B. Sodium amalgam is formed at the cathode
C. Oxygen gas is produced at the anode
D. The grahite anode dissolves
E. The resulting solution becomes acidic

Question 17 :

• WAEC 1994

If the volume of a given mass of gas at 0^oC is 27.3cm³, what will be the volume of the gas at 10^oC, pressure remaining constant?

A. 2.73cm³
B. 28.3cm³
C. 37.3cm³
D. 273cm³
E. 283cm³

Question 18 :

• WAEC 1994

Glucose can be obtained from starch by

A. Hydrogenation
B. Dissoiation
C. Hydrolysis
D. Dialysis
E. Dehydration

Question 19 :

• WAEC 1994

How many faradays of electricity are required to liberate 9g aluminium? (AI = 27)

A. 0.1
B. 0.3
C. 1.0
D. 2.7
E. 3.0

Question 20 :

• WAEC 1994

When water is dropped on calcium carbide, the gaseous product is an

A. Alkane
B. Alkene
C. Alkyne
D. Alkanol
E. Alkanal