Waec Chemistry 2007 Past Questions and Answers

Question 16:

• WAEC 2007

Which of the following gases is light than air?

A. CO₂
B. SO₂
C. HCI
D. NH₃

Question 17:

• WAEC 2007

Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules

A. Move at random
B. Undergo inelastic collisions
C. Attract each other
D. Occupy a large volume

Question 18:

• WAEC 2007

In which of the following compound (s) will heat be absorbed on adding water? l. KNO ₃
II. Concentrated H₂
SO₄ III. NH ₄CI

A. I only
B. Lll only
C. L and lll only
D. Ll and lll only

Question 19:

• WAEC 2007

Consider the reaction represented by the equation: Ca(OH)_2(aq) + CO _2(g) → CaCO3_(s) + H ₂O_(l)
in the reaction above, CO ₂ acts as

A. An acidic oxide
B. An oxidizing agent
C. A basic oxide
D. A dehydrating agent

Question 20:

• WAEC 2007

Which of the following compounds is a basic salt?

A. Mg(NO₃)₂
B. (NH₄)₂SO₄
C. K₄Fe(CN)₆
D. Zn(OH)CI