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1992 - WAEC Chemistry Past Questions and Answers - page 2

11

The scum formed when soap is mixed with hard water could be

A
calcium trioxocarbonate (IV)
B
propane- 1, 2, 3 - triol
C
calcium hydrogentrioxocarbonate (IV)
D
magnesium tetraoxosulphate (IV)
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12

What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 mins? (1F = 96500C)

A
0. 11F
B
0.12F
C
0.22F
D
1.1F
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13

''The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants''. This statement is associated with the

A
Kinetic theory
B
rate law
C
atomic theory
D
collision theory
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14

What is the following compounds will not decompose when heated strongly ?

A
NaHCO3
B
K2CO3
C
MgCO3
D
Ca(HCO3)2
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15

What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P (s) + 5O(2)(g) → 2P2O5(g)

A
0 to + 2
B
0 to 5
C
+4 to + 2
D
+4 to +5
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16

When iron rusts, it undergoes

A
deliquescence
B
chemical decomposition
C
hydrolysis
D
redox reaction
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17

Consider the compounds represented by the following general formula: X2SO4 Y2(SO4)3, 24H2OX and Y could respectively be

A
K and AI
B
Fe and K
C
AI and Fe
D
AI and K
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18

Which of the following involves the decomposition enzymic action?

A
Esterification
B
Fermentation
C
Dehydration
D
Polymerization
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19

The following salts are readily soluble in water except

A
Na2CO3
B
Pb(NO3)2
C
KCI
D
CuCO3
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20

When sucrose is warmed with Fehling's solution

A
a silver mirror is produced
B
the solution turns milky
C
a brick-red precipitate is formed
D
there is no precipitate
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