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What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
A0.1 mole
B0.2mole
C0.3 mole
D1.0 mole
E2.9 moles
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Question 2
waec1995
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
A0.1 mole
B0.2mole
C0.3 mole
D1.0 mole
E2.9 moles
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Question 3
waec1995
The following salts dissolve readily in cold water except
ACaCI2
BPbSO4
C(NH4)2SO4
DNa2CO3
ENa2SO3
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Question 4
waec1995
Copper (ll) tetraoxosulphate (VI) is often added to swimming pools because it
Aprevents the growth of algae
Bcoagulates suspended particles
Cneutralizes dissolved gases in water
Dreacts with any excess chlorine present
Eincreases the amount of dissolved oxygen
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Question 5
waec1995
Metals which react with steam only when they are red-hot include
Acopper
Bsodium
Ccalcium
Dgold
Eiron
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Question 6
waec1995
The function of limestone in the extraction of iron in the blast furnace is
Aremoval of the earthly impurities
Bdecomposition of the iron ore
Cconversion of iron (lll) to iron (ll) compounds
Dgeneration of heat for the process
Econversion of coke to carbon(ll)oxide
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Question 7
waec1995
Which of the following is an alloy of mercury?
AStainless steel
BSoft solder
CCoinage bronze
DAmalgam
EDuralumin
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Question 8
waec1995
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
ACH3CH2OH
B(CH3)2CHCH2OH
C(CH3)3CCH2OH
D(CH3)3COH
ECH3CH2CH2CH2OH
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Question 9
waec1995
In which of the following processes are larger molecules broken down into smaller molecules?
AVulcanization of rubber
BHydrogenation of palm oil
CHydrolysis of starch
DPolymerization
EEsterification
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Question 10
waec1995
The gas produced when a mixture of sodium propanoate and soda lime is heated is
Amethane
Bpentane
Cethane
Dbutene
Eethyne
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Question 11
waec1995
Fructose and glucose are classified as carbohydrates because they
Aare crystalline white solids
Bare energy -giving substances
Care naturally occurring organic compounds
Dcontain carbon oxygen and hydrogen
Econform to the general formula Cx(H2O)y
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Question 12
waec1995
The following can be obtained directly from the destructive distillation of coal except
Aammoniacal liquor
Bcoke
Cproducer gas
Dcoal gas
Ecoal tar
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Question 13
waec1995
Which of the following is hydrocarbons is unsaturated?
AEthane
BBenzene
CPropane
D2 - methylbutane
E2,2,4-trimethylpentane
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Question 14
waec1995
The following statements about graphite are correct except that it
Ais used as a lubricant
Bhas a network structure
Ccontains mobile free electrons
Dis good conductor
Eis an allotrope of carbon
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Question 15
waec1995
H3O+(aq) + OH-(aq) → 2H2O(l). The heat change accompanying the process represented by the equation above is the heat of
Aneutralization
Bformation
Csolution
Ddilution
Ehydration
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Question 16
waec1995
Which of the following is not correct of the reaction represented by the equation below? 2C(s) + O2(g) → 2CO(g); ∆H = - xKJ
Athere is an increase in entropy ;
BThere is anincrease in gaseous volume
CCarbon (lV) oxide is produced
DThe oxidation number of carbon increases from 0 to +2
EThe reaction is exothermic
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Question 17
waec1995
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
A64g
B32g
C12.8g
D6.4g
E3.2g
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Question 18
waec1995
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
A64g
B32g
C12.8g
D6.4g
E3.2g
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Question 19
waec1995
Sodium chloride cannot conduct electricity in the solid state because it
