Waec Chemistry 2003 Past Questions and Answers

Question 11:

• WAEC 2003

Substance Q reacts with cold water to form a solution which turns red litmus blue. Substance Q could be

A. Zinc
B. Phosphorus
C. Lead
D. Sodium

Question 12:

• WAEC 2003

What term is used to describe an oxide whose aqueous solution turns blue litmus red?

A. Strong electrolyte
B. Acid anhydride
C. Amphoteric oxide
D. Basic oxide

Question 13:

• WAEC 2003

The pH of 0.50 mol dm^-3 solutions of HCI, H₂SO₄ and CH₃COOH were measured. which of the following statements about the values obtained is correct?

A. The pH value was equal to 5 in each case
B. The pH values of the HCI and H₂SO₄ solutions were equal
C. Their pH values added uo to 14
D. The pH value of the CH₃COOH was the highest.

Question 14:

• WAEC 2003

Which of the following processes involves neutralization?

A. Hardening of oils
B. Souring of milk
C. Charring of sugar
D. Liming of soil

Question 15:

• WAEC 2003

Sea shells contain mainly CaCO ₃. Calcium oxide can be prepared from sea shells by

A. Adding dilute acid
B. Heating at a high temperature
C. Reduction with CO
D. Adding dilute NaOH_(aq)