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.

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

50 questions
Question 1 of 20 50 total questions
Question 1
jamb 2004

The IUPAC nomenclature of the compound above is

A2-ethylpentane
B3,4-dimethylhexane
C2,3-dimethylhexane
D2-ethylhexane
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Question 2
jamb 2004

In the experiment above, X is a mixture of nitrogen, carbon (IV) oxide and

Awater
Bimpurities
Cinert gas
Doxygen
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Question 3
jamb 2004

In the production of soap, concentrated sodium chloride solution is added to

AIncrease the solubility of soap
BDecrease the solubility of the soap
CSaponify the soap
DEmulsify the soap
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Question 4
jamb 2004

Alkanol + Alkanoic acid  ⇌  Ester + Water
The reverse reaction above is known as

AHydrolysis
BSaponification
CHydration
DFermentation
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Question 5
jamb 2004

C\(_2\)H\(_5\)OH(aq) → Y
If the above reaction takes place in conc. H\(_2\)SO\(_4\) at 180\(^0\)C, Y represents

ACH4
BC2H5COOH
CC2H4
DCH3OCH3
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Question 6
jamb 2004

CH\(_3\)COOH(g) → CH\(_4\)(g) + CO\(_2\)(g)
The reaction above is

ACarboxylation
BDecarboxylation
CAcidification
DEsterification
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Question 7
jamb 2004

Vulcanization involves the removal of

Aa monomer
Bthe single bond
Cthe double bond
Da polymer
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Question 8
jamb 2004

Which of these reagents can confirm the presence of a triple bond?

ABromine water
BAcidified KMnO4
CCopper (I) chloride
DBromine gas
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Question 9
jamb 2004

A characteristic of the alkane family is

AAddition reaction
BElimination reaction
CSubstitution reaction
DNeutralization reaction
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Question 10
jamb 2004

An isomer of C\(_5\)H\(_{12}\) is

AButane
B2 – methylbutane
C2 – methylpropane
D2 – ethylbutane
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Question 11
jamb 2004

The alkyl group can be represented by the general formula

ACnH2n+1
BCnH2n
CCnH2n+2
DCnH2n-2
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Question 12
jamb 2004

Oxyacetylene flame is used for iron-welding because it

AMakes the iron metals solidify very quickly
BCombines with oxygen to give a pop sound
CEvolves a lot of heat when burnt
DDissociates to produce carbon (IV) oxide and oxygen
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Question 13
jamb 2004

Sodium metal is always kept under oil because it

AReadily reacts with water
BIs reduced by atmospheric nitrogen
CReacts vigorously on exposure to air
DReacts with oxygen and carbon (IV) oxide
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Question 14
jamb 2004

Transition metals possess variable oxidation states because they have

AElectrons in the d orbitals
BElectron in the s orbitals
CA variable number of electrons in the p orbitals
DPartially filled p orbitals
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Question 15
jamb 2004

Alloys are best prepared by

AElectroplating
BArc-welding
CReducing and mixture of their metallic oxide
DCooling a molten mixture of the metals
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Question 16
jamb 2004

Aluminium hydroxide is used in the dyeing industry as a

ASalt
BDye
CMordant
DDispersant
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Question 17
jamb 2004

Carbon is tetravalent because

AThe electrons in both the 2s and 2p orbitals are equivalent
BThe electrons in all the orbitals of carbon are equivalent
CThe 2s and 2p atomic orbitals hybridize
DAll the atomic orbitals of carbon hybridize
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Question 18
jamb 2004

Sulphur (IV) oxide bleaches by

AReduction
BOxidation
CHydration
DAdsorption
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Question 19
jamb 2004

When steam is passed over red-hot carbon, the substances produced are

AHydrogen and trioxocarbonate (IV) acid
BHydrogen, oxygen and carbon (IV) oxide
CHydrogen and carbon (II) oxide
DHydrogen and carbon (IV) oxide
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Question 20
jamb 2004

Which of the following gases can be collected by the method of downward delivery?

AChlorine
BOxygen
CAmmonia
DHydrogen
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