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A positive reaction to Fehling's test indicates the presence of
Astrach
Breducing sugars
Coxidizing agents
Dalkanoic acids
Ealkanols
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Question 622
waec1998
The products of the reaction between CH3CH 2COOH and CH3OH are H 2
O and
ACH 3CH2COOCH3
BCH3CH 2COOCH 2CH 3
CCH3CH2CH2COOH
DCH3CH2CH2OH
ECH3COOH
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Question 623
waec1998
When alkanols react with sodium, the ga evolved is
Ahydrogen
Boxygen
Cmethane
Dethyne
Ecarbon (IV) oxide
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Question 624
waec1998
Dehydration of ethanol produces
Aethanoic acid
Bpropan-1,2,3-triol
Cethene
Dethanal
Emethanol
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Question 625
waec1998
Petrol consists mainly of
Apolymers
Balkanoates
Chydrocarbons
Dalktanols
Ealkenes
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Question 626
waec1998
Which of the following alkanes has the highest boiling point?
Apentane
Bethane
Cpropane
Dbutana
Ehexane
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Question 627
waec1998
The liquid product of the destructive distillation of coal is
Akerosene
Bethanol
Cammoniacal liquor
Dparaffin oil
Eaqueous ammonia
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Question 628
waec1998
Which of the following can undergo both addition reactions and substitution reactions?
ABenzene
BPentane
CPropene
DHexane
EEthene
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Question 629
waec1998
A device used in the laboratory for intermittent production of gases without heating is
ALeibing condenser
Baspirator
Cdelivery tube
Dinverted funnel
EKipp's apparatus
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Question 630
waec1998
Metals are said to be malleable because they
Aare good conductors heat
Bare good conductors of electricity
Ccan be beaten into sheets
Dcan be alloyed
Ecan be polished
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Question 631
waec1998
Aluminium is extracted from
Amagnetite
Bcryolite
Cbauxite
Dcassiterite
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Question 632
waec1998
Rusting of iron is an example of
Adeliquescence
Bdecomposition
Cdisplacement reaction
Dredox reaction
Ereversible reaction
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Question 633
waec1998
Two metallic ions commonly present in hard water are
ACa2+ and Zn2+
BCu2+ and Na+
CMg2+ and Ca2+
DFe2+ and Na+
EZn2+ and Cu2+
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Question 634
waec1998
The spontaneity of a chemical reaction is determined by the change in the
Aconcentration of the reactants
Btemperature of the system
Cfree energy of the system
Dpressure applied to the system
Evolume of the reactants
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Question 635
waec1998
Which of the following can be added to dissolve the precipitate formed in the reaction represented by the following equation? CaCl2(aq) + H2C2O 4(s) ⇌ CaC 2O2
ACalcium chloride solution
BConcentrated hydrochloric acid
CEthanol
DEthanedioc acid
EAqueous ammonia
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Question 636
waec1998
Pipe-borne water is usually chlorinated in order to
Aimprove the teste of the water
Bremove the hardness in the water clear
Ccoagulate sediments in the water
Dkill harmful bacteria in the water
Emake the water clear and colourless
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Question 637
waec1998
Substances which absorb water from the atmosphere without dissolving in it are sid to be
Aanhydrous
Bhygroscopic
Cinsolube
Dhydrated
Eefflorescent
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Question 638
waec1998
How many electrons are removed from Cr2- when it is oxidized to CrO42-?
Ao
B2
C4
D8
E10
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Question 639
waec1998
What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]
A0.318g
B0.635g
C18g
D6.35g
E9.65g
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Question 640
waec1998
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
