Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.
The greenhouse effect is a climatic condition associated with the presence of excess
Acarbon (IV) oxide
Bhydrogen sulphide
Cnitrogen (ll) oxide
Dammonia gas
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Question 2
waec1999
Environmental pollution problems are generally more severe in countries which have
Adense population
Blow birth rate
Cgreat land mass
Dlimited industries
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Question 3
waec1999
Which of the following is needed to produce slag during the extraction of iron in the blast furnace?
ACryolite
BLimestone
CCarbon
DSulphur
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Question 4
waec1999
Geometric (cis-trans) isomerism is exhibited by
AC 2H 2CI 2
BCH2CI5
CC 4H 10
DC5H12
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Question 5
waec1999
Which of the following is a secondary alkanol?
AOHCI2-CH2OH
BH2C=CH-CH2OH
CCH 3-CH(OH)-CH 3
DCH3-(CH2)3-CH2OH
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Question 6
waec1999
Alkanoates are produced from alkanols by
Afermentation
Bsaponification
Coxidation
Desterification
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Question 7
waec1999
Which of the following compounds reacts with sodium hydroxide to form a salt?
ACH 3CH 2COOH
B(CH3) 3COH
CCH3CH=CH 2
DC 6H 12O 6
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Question 8
waec1999
Which of the following compounds is unsaturated?
A2-methylbutane
BChloromethane
CMethylbenzene
D1,2-dibromoethane
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Question 9
waec1999
Which of the following is the most reactive towards bromine?
AMethane
BBenzene
CEthyne
DHexane
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Question 10
waec1999
How many carbon atoms are present in one molecule of 2-methylpropane?
A2
B3
C4
D5
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Question 11
waec1999
When dilute copper (ll) chloride solution is electrolysed, the reaction at the cathode is represented by the equation
ACu → Cu2+ + 2e-
BCu2+ + 2e- → Cu
C40H- - 4e- → O2 + 2H2O
D2CI- → CI2 + 2e
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Question 12
waec1999
Equal volumes of water were added to one mole of each of the following compounds. Which of them produced the largest number of ions
AGlucose
BSodium trioxonitrate (V)
CEthananoic acid
DSilver chloride
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Question 13
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Which of the following is not correct about oxidation number convention? The oxidation number of a/an
Aelement in the free state is zero
Bmonatomic ion is equal to its charge
Calkali meta like sodium in its compounds is + 1
Datom of a diatomic molecules is + 2
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Question 14
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What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)
AActivation energy will decrease
Bthe forward reaction will be favoured
Cthe concentration of ammonia will increase
Dthe reaction will go to completion
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Question 15
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Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as
Athe temperature is raised
Bthe pressure increased
Cthe volume of the system is increased
Da catalysty is intoduced into the system
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Question 16
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Which of the following lowers the activation energy of a chemical reaction?
AFreezing mixture
BReducing agent
CWater
DCatalyst
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Question 17
waec1999
The property of calcium chloride which makes it useful as a drying agent is that it is
Aionic
Bdeliquescent
Ca strong electrolyte
Da normal salt
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Question 18
waec1999
If the solubility of KHCO3 is 0.40 mole dm-3 at room temperature , calculate the mass of KHCO3 in 100dm3 of the solution at this temperature. [KHCO3 = 100hmol
A4.0g
B10.0g
C40.0g
D100.0g
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Question 19
waec1999
Which of the following compounds dissolves in water to form a solution with pH below 7?
