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1990 - WAEC Chemistry Past Questions and Answers - page 3

21

The following alloys contain copper except

A
magnalium
B
duralumn
C
bronze
D
brass
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22

How many mole of AgNO 3 are there in 500cm3 of 0.01MAgNO3 solution?

A
0.005 mole
B
0.05 mole
C
0.5 mole
D
5 moles
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23

Which of the following statements explains why tetraoxosulphate (IV) acid is reqarded as a strong acid?

A
Tetraoxosulphate (IV) acid is dibasic
B
the acid is concentrated
C
the acid is complately ionized in aqueous solution
D
tetraxosulphate (IV) ions are very reactive
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24

Which of the following is not correct of glucose and fructose?They

A
are structural isomers
B
reduce fehling's solution
C
can be obtained by the hydrolysis of starch
D
are readily fermented by enzymes
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25

To what temperature must a gas be raised from 273K in order to double both its volume and pressure?``

A
298k
B
300k
C
546k
D
819k
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26

Which of the following explains why trioxonitrate (V) acid is not used for preparing hydrogen from metals?

A
it is volatile
B
it is strongly oxidizing
C
it forms a layer of oxide on the metal
D
trioxonitrate (V) salts are soluble in water
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27

Which of the following is normally used for drying ammonia gas?

A
Concentrated tetraoxonitrate (Vl) acid
B
Calcium oxide
C
anhydrous calcium chloride
D
phosphorus (V) oxide
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28

Nuclear reactions can be used in the following except

A
gauging the thickness of objects
B
making atomic bombs
C
curing cancer
D
generating electricity
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29

The decomposition of hydrogen peroxide is represented by the equation: 2H2O(l) + O2(g) what mass of hydrogen peroxide would be required to produce 22.4dm3 of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm3)

A
18 g
B
34 g
C
36 g
D
64 g
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30

Which of the following compounds crystallizes without water of crystallization?

A
Na2CO3
B
CuSO4
C
MgSO4
D
NaCI
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