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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

Question 1 of 9 49 total questions

Question 21

jamb 1982

Which of the following statements is incorrect?

ACalcium reacts with water to form calcium

BMagnesium reacts very slowly with water but faster with warm water

CIron will not react with water in the absence of air

DSodium reacts with water

ECopper reacts with steam

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Question 22

jamb 1982

Sodium carbonate crystals on exposure to a dry atmosphere change to a white powder. This phenomenon is known as?

Adeliquescence

Bhygroscopy

Coxidation

Defforescence

Esublimation

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Question 23

jamb 1982

The product formed at the the cathode during the electrolysis of sodium chloride solution with carbon electrodes is?

Asodium

Bchlorine

Chydrogen

Dsodium hydroxide

Eoxygen

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Question 24

jamb 1982

Which of the following types of reactions takes place between C2H6 and the halogens?

ASubstitution

BPolymerization

CAddition

DSaponification

EOxidation

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Question 25

jamb 1982

Cotton is almost pure?

Astarch

Bprotein

Canimal fibre

Dcelluose

Emineral fibre

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Question 26

jamb 1982

Water is poured over a white solid and a colourless neutral gas is evolved which burns with a sooty flame. The white solid is?

Acalcium

Bcalcium oxide

Ccalcium carbide

Dsodium peroxide

Esodium sulphate

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Question 27

jamb 1982

An amphoteric oxide is an?

Aamorphous oxide of a metal

Bamorphous oxide of a non-mental

Coxide that is insoluble in water

Doxide that behaves both as a base as well as an acid

Eoxide that loses its oxygen on sublimation

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Question 28

jamb 1982

Which of the following statements is correct during the electrolysis of a caustic soda solution using platinum electrodes?

AOxygen gas is given off at the cathode

BHydrogen gas is given of at the anode

CSodium metals is deposited at the anode

DSodium metal is deposited at the cathode

EAAlkalinity at the cathode increases

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Question 29

jamb 1982

An acid is said to be weak if?

Aits ions are so completely dissociated that they easily drift apart

Bthe acid is not corrosive

Cthe acid has low specific gravity

Dits ions move very slowly when in solution

Eits ions are incompletely dissociated

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