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Chemistry Past Questions

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1,623 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Question 811

waec 1985

A sample of air that has been passed through caustic potash will

Acontain more oxygen than nitrogen

Brekindle a glowing splint

Chave no action on lime water

Dcontain no water vapour

Ebe free of noble gases

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Question 812

waec 1985

Chlorine is prepared on a large scale by the

Aelectrolysis of concentrated sodium chloride solution

Baction of manganese (IV) oxide on hot concentrated hydrochloric acid

Caction of concentrated tetraoxosulphate (IV) acid on sodium chloride

Doxidation of concentrated hydrochloric acid with potassium tetraxosulphate (VII)

Eaction of dilute mineral acids on bleaching powder

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Question 813

waec 1985

Which of the following oxides is amphoteric?

ANa₂O

BFe₂O₃

CAI₂O₃

DCaO

ECuO

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