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1992 - WAEC Chemistry Past Questions and Answers - page 3

21

Which of the following gases will have the highest rate of diffusion under the same conditions? (H = 1, C =12, O = 16, S = 32, CI = 35.5)

A
O2
B
CI2
C
HCI
D
H2S
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22

The formula (CH3),3 COH is that of a

A
polyhdric alkanol
B
secondary alkanol
C
tertiary alkanol
D
primary alkanol
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23

What is the number of oxygen atoms in 32g of the gas? (O = 16, L = 6.0 X 10,23 mol-1)

A
3.2 X 10 23
B
6.0 X 1023
C
1.2 X 1024
D
1.6 X 1024
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24

Which of the following compounds is not correct about the reaction of sodium material for the manufacture of plastics?

A
Ethyne
B
Ethane
C
Monochloroethene
D
Propene
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25

The energy required to remove the most loosely bound electron from an atom in the gaseous state is known as the

A
bond energy
B
ionization energy
C
potential energy
D
activation energy
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26

Vulcanization of rubber

A
stops the growth of fungus on the rubber
B
increases the solubility of the rubber
C
decreases the elasticity of the rubber
D
hardnes the rubber through cross-linkage
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27

If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?

A
the reaction vessel gets hotter as the reaction proceeds
B
∆H for the reaction is positive
C
the rate of the reaction increases with time
D
the activation energy of the reaction is high
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28

If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?

A
the reaction vessel gets hotter as the reaction proceeds
B
∆H for the reaction is positive
C
the rate of the reaction increases with time
D
the activation energy of the reaction is high
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29

Which of the following statement is not correct about esterification?

A
It is a slow reaction
B
the process is reversible
C
it is similar to hydrolysis
D
it is catalysed by acids
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30

Which of the following statements is not correct? The 4s orbital

A
is defined by the quantum number 1 = O
B
is of higher energy than the 3d orbital
C
contains a maximum of two electrons
D
is spherical about the nucleus
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