Waec Chemistry 2012 Past Questions and Answers

Question 11:

• WAEC 2012

The shape of a graphite crystal is

A. Tetrahedral
B. Pyramidal
C. Hexagonal
D. Octahedral

Question 12:

• WAEC 2012

The complex compound formed by the combination of two elements with a large electronegativity difference is likely to be

A. Polar covalent
B. Giant molecular
C. Covalent
D. Ionic

Question 13:

• WAEC 2012

The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is

A. Na₃Al(OH)₄.
B. NaAl(OH)₄
C. NaAl(OH)₃
D. Na₂Al(OH)₃

Question 14:

• WAEC 2012

The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together

A. L only
B. L and ll only
C. L and lll only
D. Ll and lll only

Question 15:

• WAEC 2012

MgO does not readily dissolve in water because

A. Of its high melting point
B. It is a covalent compound
C. It forms a hydroxide when dissolved in water
D. Its lattice energy is higher than its hydration energy