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2000 - WAEC Chemistry Past Questions and Answers - page 2

11

An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?

A
ZSO3
B
Z2CI3
C
Z2O3
D
ZS3
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12

Which of the following increases as boiling water changes to steam?

A
temperature of the system
B
degree of disorder in the system
C
number of molecules
D
activation energy
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13

9.60 g of a gas X occupies the same volume at 0.30 g of hydrogen under the same conditions. Calculate the molar mass of X [H = 1]

A
8g mol -1
B
16 gmol -1
C
32g mol -1
D
64g mol -1
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14

Which of the following gases is colourless, odourless and soluble in potassium hydroxide solution?

A
NO 2
B
SO 2
C
NH 2
D
CO3
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15

The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is

A
hydrogen
B
oxygen
C
carbon (IV) oxide
D
sulphur (VI) oxide
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16

If a solution has a pH of 2, it can be concluded that it

A
is a weak electrolyte
B
has hyrogen ion concentration of 0.2 mol sm-3
C
is twice as acidic as a solution of pH 1,
D
will produce effervescence with magnesium ribbon
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17

Which of the following salts is stable to heat?

A
K2CO3
B
(NH4)2SO4
C
NaHCO 3
D
AgNO3
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18

Which of the following compounds dissolves in water to give an alkaline solution?

A
Ammonium chloride
B
Sodium chloride
C
Sulphur (IV) oxide
D
Potassium oxide
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19

Which of the following salts is stable to heat?

A
K 2CO 3
B
(NH 4) 2SO 4
C
NaHCO3
D
AgNO3
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20

What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?

A
Redox reaction
B
Destructive distillation
C
Dehydration
D
Nutralization
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