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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.

45 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

45 questions

Question 1 of 20 45 total questions

Question 1

jamb 2014

Z in diagram above represents

Aheat of reaction

Bactivation energy

Cfree energy

Dentropy of reaction

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Question 2

jamb 2014

In the diagram, the function of the concentrated H2SO4 is to?

Apurify the gas

Bdry the gas

Cliquefty the gas

Dremove odour

View Explanation & Discuss

Question 3

jamb 2014

The IUPAC nomenclature of the compound above is

A2-bromo-3-chlorobutanol

B3-bromo-2-chlorobutanol

C3-chloro-2-bromobutanol

D2-chloro-3-bromobutanol

View Explanation & Discuss

Question 4

jamb 2014

The petroleum fraction that is used in heating furnaces in industries is

Adiesel oil

Bgasoline

Ckerosene

Dlubricating oil

View Explanation & Discuss

Question 5

jamb 2014

The process of converting linear alkanes to branched chain and cyclic hydrocarbons by heating in the presence of a catalyst to improve the quality of petrol is referred to as

Arefining

Bcracking

Creforming

Dblending

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Question 6

jamb 2014

Polystyrene is widely used as packaging materials for fragile objects during transportation because of its

Alightness

Blow density

Chigh density

Dhigh compressibility

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Question 7

jamb 2014

A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula.

[C = 12, H = 1]

AC₂H₆

BC₃H₈

CC₃H₄

DC₆H₆

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Question 8

jamb 2014

CH3COOC2H5(1) + H2O(1) ⇌ CH 3COOH (aq) + C 2H 5OH (aq)

The purpose of H+ in the reaction above is to

Aincrease the yield of products

Bmaintain the solution at a constant PH

Cincrease the rate of the hydrolysis

Ddecrease the rate of the reverse reaction

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Question 9

jamb 2014

The polymer used in making car rear lights is

Aperspex

Bbakeelite

Cpolystyrene

Dpolyacrylonitrile

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Question 10

jamb 2014

The process of converting starch to ethanol is

Acracking

Bdistillation

Cfermentation

Doxidation

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Question 11

jamb 2014

Due to the unstable nature of ethyne, it is stored by dissolving in

Aethane-1,2-diol

Bpropanol

Cethanoic acid

Dpropanone

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Question 12

jamb 2014

Ethyne is passed through a hot tube containing organo-nickel catalyst to produce

Aisoprene

Bpolythene

Cethanol

Dbenzene

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Question 13

jamb 2014

The alkanol obtained from the production of soap is

Apropanol

Bethanol

Cglycerol

Dmethanol

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Question 14

jamb 2014

The general formula of haloalkanes where X represents the halide is

AC_n H _2n-1X.

BC _nH _2nX.

CC _nH _2n+2 X

DC _nH _2n+1X

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Question 15

jamb 2014

A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is

AZn²⁺

BPb²⁺

CCa²⁺

DAl³⁺

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Question 16

jamb 2014

A compound that gives a brick-red colour to a non-luminous flame is likely to contain

Acopper ions

Bsodium ions

Ccalcium ions

DPotassium ions

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Question 17

jamb 2014

In the electrolytic extraction of calcium from calcium chloride, the cathode is

Azinc

Bgraphite

Cplatinum

Diron

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Question 18

jamb 2014

In the extraction of sodium from fused sodium chloride, the anode is made of platinum because

Asodium is formed at the anode

Bchlorine is formed at the anode

Csodium does not react with platinum

Dchlorine does not react with platinum

View Explanation & Discuss

Question 19

jamb 2014

Fluorine does not occur in the free state in nature because

Ait is a poisonous gas

Bit belongs to the halogen family

Cit is inert

Dof its high reactivity

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Question 20

jamb 2014

In a chemical reaction, the change in concentration of a reactant with time is

Aentropy of reaction

Benthalpy of reaction

Crate of reaction

Dorder of reaction

View Explanation & Discuss

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