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Chemistry WAEC / WASSCE 2005 Reaction Rates & Chemical Equilibrium
Which of the following factors does not affect the rate of reaction of CaCO3 with HCI?
A
temperature of the reaction
B
solubility of the CaCO3
C
concentration of the HCI
D
surface area of the CaCO3
medium Difficulty
Chemistry WAEC / WASSCE 2005 Stoichiometry, Mole Concept & Volumetric Analysis
When X is heated with manganese (IV) oxide, oxygen is produced X is
A
KCI
B
KCIO3
C
CaCO3
D
ZnCO3
medium Difficulty
Chemistry WAEC / WASSCE 2005 Kinetic Theory of Matter & Gas Laws
Which of the following statements is not a postulate of the kinetic theory of gases?
A
Molecules move with the same speed
B
intermolecular forces are negligible
C
Molecules are in a state of constant random motion
D
collision between molecules is elastic
medium Difficulty
Chemistry WAEC / WASSCE 2005 Oxidation, Reduction & Redox Reactions
HNO3 does not usually react with metals to liberate hydrogen because HNO3 is
A
a strong acid
B
a corrosive acid
C
an oxidizing agent
D
a nitrating agent
medium Difficulty
Chemistry WAEC / WASSCE 2005 Acids, Bases, pH & Salts
Which of the following is not an acid anhydride?
A
P 2O 5
B
NO 2
C
SO 2
D
CO
medium Difficulty
Chemistry WAEC / WASSCE 2005 Stoichiometry, Mole Concept & Volumetric Analysis
NaHCO3(s) can be distinguished from Na2CO3(s) by the action of
A
dilute hydrochloric acid
B
carbon (IV) oxide
C
aqueous ammonia
D
heat
medium Difficulty
Chemistry WAEC / WASSCE 2005 Acids, Bases, pH & Salts
What process is involved in the reaction represented by the following equation? AICI3 + 3H2O(l) → AI(OH) 3(s) + 3HCI(g)
A
dehydration
B
hydrolysis
C
double decomposition
D
Neutralization
medium Difficulty
Chemistry WAEC / WASSCE 2005 Water, Solutions & Solubility
A salt that absorbs moisture from the atmosphere without forming a solution is said to be
A
efflorescent
B
deliquescent
C
hygroscopic
D
insoluble
medium Difficulty
Chemistry WAEC / WASSCE 2005 Stoichiometry, Mole Concept & Volumetric Analysis
Consider the reaction represented by the equation below, xNH3(g) + yCI2(g) → zHCI(g) + N2(g) The values of x,y and z are respectively
A
2, 4, 6
B
3, 2, 4
C
2, 3, 6
D
3, 2 6
medium Difficulty
Chemistry WAEC / WASSCE 2005 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following compounds dissolves readily in water?
A
BaSO4
B
CuSO3
C
NH4CI
D
AgCI
medium Difficulty
Chemistry WAEC / WASSCE 2005 Reaction Rates & Chemical Equilibrium
When ice is changing to water, its temperature remains the same because the heart gained is
A
used to separate the molecules
B
lost partially to the atmosphere
C
used to increase the volume of ice
D
less than the activation energy
medium Difficulty
Chemistry WAEC / WASSCE 2005 Acids, Bases, pH & Salts
Which of the following methods is suitable for preparing insoluble salts?
A
Thermal decomposition
B
Oxidation
C
Double decomposition
D
Neutralization
medium Difficulty
Chemistry WAEC / WASSCE 2005 Acids, Bases, pH & Salts
Which of the elements will burn in excess oxygen to form a product that is neutral to litmus?
A
Carbon
B
Hydrogen
C
Sulphur
D
Sodium
medium Difficulty
Chemistry WAEC / WASSCE 2005 Electrolysis & Electrochemical Cells
The main difference between a primary cell and a secondary cell is that the primary cell
A
is an electrolytic cell but the secondary is not
B
cannot be recharged but the secondary cell can
C
can be recharged but the secondary cell cannot
D
contains electrodes but the secondary cell does not
medium Difficulty
Chemistry WAEC / WASSCE 2005 Oxidation, Reduction & Redox Reactions
Determine the mass of copper deposited by 4.0 moles of electrons in the reaction represented by the equation below: Cu2(aq) + 2e- → Cu(s)
A
32
B
64
C
128
D
256
medium Difficulty
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