Question 801:

• JAMB 1993

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?

A. Passed over heated copper (II) oxide
B. Bubbled through concentrated tetraoxosulphate (IV) acid
C. Bubbled through sodium hydroxide solution
D. Bubbled through water

Question 802:

• JAMB 1993

Which of the following is a property of ionic chlorides?

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

Question 803:

• JAMB 1993

When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.
The products of this reaction are?

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)

Question 804:

• JAMB 1993

Bronze is an alloy of?

A. Silver and copper
B. Silver and gold
C. Copper and nickle
D. Copper and zinc
E. Copper and tin

Question 805:

• JAMB 1993

The active reducing agent in the blast furnace for the extraction of iron is?

A. Carbon
B. Limestone
C. Carbon(II)oxide
D. Calcium oxide