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Chemistry Past Questions

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.

49 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

49 questions
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Question 1 of 20 49 total questions
Question 1
jamb 1993
The fraction of crude oil used as jet fuel is
Arefinery gas
Bdiesel oil
Ckerosine
Dgasoline
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Question 2
jamb 1993
At 25oC and 1atm, a gas occupies a volume of 1.50dm3. What volume will it occupy at 100oC and 1atm?
A1.88 dm3
B6.00 dm3
C18.80 dm3
D18.80 dm3
E60.00dm3
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Question 3
jamb 1993

The dissolution of common salt in water is a physical change because

Athe salt can be obtained by crystallization
Bthe salt can be recovered by the evaporation of water
Cheat is not generated during mixing
Dthe solution will not boil at 100oC
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Question 4
jamb 1993
The function of the copper (ll)tetraoxosulphate (IV) in dilute H2SO4 in the figure above is to
Adry the gas
Babsorb phosphine impurity
Cabsorb ethene impurity
Dfrom an acetylide with ethyne
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Question 5
jamb 1993
The IUPAC nomenclature for the compound above is
Adimethlhexane
B3,5 dimethylhexane
C1.1 dmethyl, 3 methylpentane
D2.4 dimethylhexane
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Question 6
jamb 1993

The two functional groups in the above compound are

Aalcohol and amine
Bacid and amine
Caldehyde and acid
Dketone and amine
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Question 7
jamb 1993
In the diagram above, curve X represents the energy profile for a homogeneous gaseous reaction. Which of the following conditions would produce curve Y for the same reaction?
AIncrease in temperature
BIncrease in the concentration of a reactant
CAddition of a catalyst
DIncrease in pressure
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Question 8
jamb 1993

Half-cell reaction. From the data above , it can be deduced that the most powerful reducing agent of the four metals is

ACu
BFe
CBa
DZn
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Question 9
jamb 1993

For which salt in the graph above does the solubility increase most rapidly with rise in temperature?

ACaSO4
BKNO3
CNaCl
DKCl
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Question 10
jamb 1993
Which of the curves above represents the behaviour of 1 mole of an ideal gas?
Al
Bll
Clll
DlV
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Question 11
jamb 1993

A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?

Asulphur (ii) oxide
Bhydrogen sulphide
Csulphide (lV) oxide
Dhydrogen chloride
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Question 12
jamb 1993
The confirmatory test for alkanoic acids in organic qualitative analysis is the?
Aturning of wet blue litmus paper red
Breaction with alkanols to form esters
Creaction with sodium hydroxide to form salt and water
Dreaction with aqueous Na2COsp3 to liberate a gas which turns lime water milky
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Question 13
jamb 1993
Which of the following represents saponification?
AReaction of carboxylic acids with sodium hydroxide
BReaction of alkanoates with acid
CReaction of alkanoates with alcohols
DReaction of alkanoates with sodium hydroxide
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Question 14
jamb 1993
Catalytic hydrogenation of benzene produces?
Aan aromatic hydrocarbon
Bmargarine
Ccyclohexane
DD.D.T
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Question 15
jamb 1993
Palm wine turns sour with time because?
Athe sugar content is converted into alcohol
Bthe carbon (IV) oxide formed during the fermentation process has a sour taste
Cit is commonly adulterated by the tappers and sellers
Dmicrobial activity results in the production of orgain acids within it
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Question 16
jamb 1993
The carbon atoms on ethane are?
Asp2 hybridized
Bsp3 hybridized
Csp2d hybridized
Dsp hybridized
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Question 17
jamb 1993
Al2O3(s) + 3H2SO4(aq) → Al2(SO4(aq)) + 3H2(I)O
Al2O3(s) + 2NaOH(aq)) + 3H2(I)O → 2NaAl(OH)4(aq)).
We can conclude from the equations above that Al2O3(s) is?
Aan acidic oxide
Ban amphoteric oxide
Ca basic oxide
Da neutral oxide
View Explanation & Discuss
Question 18
jamb 1993
It is not desirable to use lead tetraethyl as an anti-knock agent because?
Ait is expensive
Bof pollution effects from the exhaust fumes
Cit lowers the octane rating of petrol
Dit is explosive
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Question 19
jamb 1993
The fraction of crude oil used as jet fuel is?
Arefinery gas
Bdiesel oil
Ckerosene
Dgasoline
View Explanation & Discuss
Question 20
jamb 1993
The active reducing agent in the blast furnace for the extraction of iron is?
Acarbon
Blimestone
Ccarbon(II)oxide
Dcalcium oxide
View Explanation & Discuss
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