Waec Chemistry 2000 Past Questions and Answers

Question 11:

• WAEC 2000

What is the shape of a molecule of CCI₄?

A. Pyramidal
B. Tetrahedral
C. Trigonal planar
D. Linear

Question 12:

• WAEC 2000

An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?

A. ZSO₃
B. Z₂CI₃
C. Z₂O₃
D. ZS₃

Question 13:

• WAEC 2000

Which of the following increases as boiling water changes to steam?

A. Temperature of the system
B. Degree of disorder in the system
C. Number of molecules
D. Activation energy

Question 14:

• WAEC 2000

9.60 g of a gas X occupies the same volume at 0.30 g of hydrogen under the same conditions. Calculate the molar mass of X [H = 1]

A. 8g mol ^-1
B. 16 gmol ^-1
C. 32g mol ^-1
D. 64g mol ^-1

Question 15:

• WAEC 2000

Which of the following gases is colourless, odourless and soluble in potassium hydroxide solution?

A. NO ₂
B. SO ₂
C. NH ₂
D. CO₃