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1999 - WAEC Chemistry Past Questions and Answers - page 2

11

The crystal layers in graphite are held together by

A
electrostatic forces
B
van der Waals' forces
C
hydrogen bonds
D
covalent bonds
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12

Which of the following compounds has the highest ionic character?

A
PCI5
B
SiCI4
C
AICI3
D
KCI
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13

If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly

A
covalent
B
ionic
C
dative
D
metallic
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14

One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]

A
122
B
101
C
53
D
40
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15

Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of

A
diffusion
B
combustion
C
absorption
D
emission
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16

Which of the following movements can be described as random motion?

A
wheelbarrow being pushed
B
car travelling on a straight line
C
Gas molecules colliding in a flask
D
Planets going round the sun
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17

Equal volumes of CO2 cnd CO at s.t.p have the same

A
mass
B
density
C
rate of diffusion
D
number of molecules
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18

Gas molecules are said to be perfectly elastic because

A
they collide without loss of energy
B
they move about in straight lines
C
the distances between them are negligible
D
the volume occupied by them is negligible
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19

What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]

A
0.040dm 3
B
0.896dm 3
C
5.82dm 3
D
8.62dm 3
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20

Helium is preferred to hydrogen in filling balloons because hydrogen

A
is inflammable
B
is diatomic
C
exhibits isotopy
D
is a component of water
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