UTME Chemistry 1993 JAMB Past Questions and Answers, Jamb, Pre-degree, Nursing, Waec, Neco

UTME Chemistry 1993 JAMB Past Questions and Answers

1. An experiment produces a gaseous mixtures of carbon (IV) oxide and carbon (II) oxide. In order to obtain pure carbon (II) oxide, the gas mixture should be?

Options

A) passed over heated copper (II) oxide

B) bubbled through concentrated tetraoxosulphate (IV) acid

C) bubbled through sodium hydroxide solution

D) bubbled through water

The correct answer is C.

2. Which of the following is a property of ionic chlorides?

Options

A) They can be decomposed by heat

B) They react with aqueous AgNO₃ to give a white precipiate which is soluble in excess ammonia

C) They explode when in contact with dry ammonia

D) They react with concentrated tetraoxosulphate (IV) acid to give white fumes of chlorine gas

The correct answer is B.

3. When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.

The products of this reaction are?

Options

A) PbO_(s) + Br^– + KNO₃

B) Br₂ + NO_2(g) + PbBr_2(s)

C) PbO_(s) + K⁺_(aq) + Br_(aq) + NO_2(g)

D) PbBr_2(s) + K_(aq) + K⁺_(aq) + NO_3(aq)

The correct answer is D.

4. Bronze is an alloy of?

Options

A) silver and copper

B) silver and gold

C) copper and nickle

D) copper and zinc

E) copper and tin

The correct answer is E.

Explanation:

Bronze is an alloy of copper and tin.

5. A reaction takes places spontaneously if?

Options

A) ∆G = O

B) ∆S < O and ∆H > O

C) ∆H < T ∆S

D) ∆G > O

The correct answer is C.