Waec Chemistry 2008 Past Questions and Answers

Question 11:

• WAEC 2008

Water molecules are held together by

A. Covalent bond
B. Hydrogen bond
C. Ionic forces
D. Van der Waals forces

Question 12:

• WAEC 2008

The force of attraction between covalent molecules is

A. Dative bonding
B. Hydrogen bonding
C. Ionic force
D. Van der Waals forces

Question 13:

• WAEC 2008

What is the mass of 6.02 x 10²⁴ atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10²³ atoms mol^-1]

A. 240g
B. 24 g
C. 2.4g
D. 0.24g

Question 14:

• WAEC 2008

Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14]

A. NH₃ = 17
B. NH₄CI = 53.5
C. NH₄NO₃ = 80
D. (NH₃)₂SO₄ = 132

Question 15:

• WAEC 2008

Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14]

A. NH₃ = 17
B. NH₄CI = 53.5
C. NH₄NO₃ = 80
D. (NH₃)₂SO₄ = 132