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Detergents are better than soaps for laundry because
Adetergents are synthetic while soaps are not
Bdetergents are more soluble in water than soaps
Cscum is precipitated when soaps are used with hard water but not with stergents
Dsoaps from soluble saits with ions causing hardness of water while detergents do not
Esoaps are in bars while detergents are in powder form
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Question 1893
waec1988
A salt which loses mass when exposed to air is
Ahygroscopic
Bdeliquescent
Cefflorescent
Dfluorescent
Eeffervescent
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Question 1894
waec1988
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
ACH2
BCH3
CC2H2
DC2H4
EC2H6
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Question 1895
waec1988
Given that 32.0g sulphur contains 6.02 x 10 23 sulphur atoms how many atoms are there in 2.70g of aluminium? {Al = 27, S =32}
A6.02 x 10 23
B3.01 x 1022
C6.02 x 1022
D5. 08 x 1022
E3.01 x 1022
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Question 1896
waec1988
Which of the following does not affect the rate of a chemical reaction?
AAddition or presence of a catalyst
BSize of the reacting particles
CThe enthalpy change for the reaction
DConcentration of the reactants
ETemperatureat which the reaction is carried out
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Question 1897
waec1988
Which of the following does not affect the rate of a chemical reaction?
AAddition or presence of a catalyst
BSize of the reacting particles
CThe enthalpy change for the reaction
DConcentration of the reactants
ETemperatureat which the reaction is carried out
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Question 1898
waec1988
Which of the following compound is aromatic?
ABenzene
BCyclobutane
CCyclopentane
DHexane
EEthene
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Question 1899
waec1988
The reaction represented by the equation NaOH(aq) + HCI(aq) → NaCI(aq) + H2O(/)
Ais a double decomposition
Bis a neutralization
Cis reversible
Dis usually catalysed
Eattains equilibrium after a few seconds
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Question 1900
waec1988
The following are uses of sulphur except
Amanufacture of tetraoxosulphate (VI) acid
Bprevention of the growth of fungi
Cvulcanization rubber
Dmanufacture of dyes
Ecoating of steel to prevent rusting
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Question 1901
waec1988
An acid present in proteins is
Alactic acid
Bamino acid
Cpropanoic acid
Dpalmitic acid
Estearic acid
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Question 1902
waec1988
Equilibrium is said to be attained in reversible reaction when
Aall the reactants have been used up
Ball the products have been formed
Cthere is no further change in temperature
Dthe rates of the forward and backward reactions are equal
Ethe rate of formation of the products decreases with time
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Question 1903
jamb1988
The acidic hydrogen in the compound is the hydrogen attached to carbon number
A5
B4
C3
D1
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Question 1904
jamb1988
Carbon (ll) oxide may be collected as shown above because
Ais heavier than air
Bis less dense than air
Cis insoluble in water
Dburns in oxygen to form carbon (IV) oxide
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Question 1905
jamb1988
The IUPAC name for
A2-methylbutanoic acid
B2-methyl-1- hydroxyketone
C2-methyl-1-hydroxy aldehyde
D2-methylpentanoic acid
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Question 1906
jamb1988
The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by
Al
Bll
Clll
DlV
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Question 1907
jamb1988
Use the graph above to answer this question. The mass of a substance, M, liberated at an electrode during electrolysis is proportional to the quantity of electricity, Q passing through the electrolyte. This is represented graphically by.
AA
BB
CC
DD
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Question 1908
jamb1988
Which of the gas laws does the above graph illustrate?
ABoyle
BCharles
CGraham
DGay-Lussac
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Question 1909
jamb1988
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
Aevaporation
Brecrystallization
Csublimation
Dfractional precipitation
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Question 1910
jamb1988
An eruption pollution an environment with gas suspected to be H2S, a poisonous gas. A residue team should spray the environment with?
