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Chemistry

Chemistry past questions and answers from WAEC and JAMB
Page 19

A liquid begins to boil when

a.

Its vapour pressure is equal to the vapour pressure of its solid at the given temperature

b.

Molecules start escaping from its surface

c.

Its vapour pressure equals the atmospheric pressure

d.

Its volume is slightly increased

The flame used by welders in cutting metals is

a.

Butane gas flame

b.

Acetylene flame

c.

Kerosene flame

d.

Oxy-acetylene flame

The number of electrons in the valence shell of an element of atomic number 14 is

a.

1

b.

2

c.

3

d.

4

The chemical used for coagulation in water purification is

a.

Aluminium tetraoxosulphate (VI)

b.

Copper tetraoxosulphate (VI)

c.

Sodium tetraoxosulphate (VI)

d.

Calcium tetraoxosulphate (VI)

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