Jamb Chemistry 1982 Past Questions and Answers

Question 21:

• JAMB 1982

If the temperature of a gas is increased?

A. The kinetic energy of the emolecules will decrease
B. The pressure will decrease if the volume is constant
C. The gas will occupy a greater volume if the pressure is constant
D. The mass of the gas will decrease
E. The pressure and volume will increase

Question 22:

• JAMB 1982

When a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to ai. The metal nitrate is therefore?

A. Sodium nitrate
B. Mercuric nitrate
C. Lithium nitrate
D. Silver nitrate
E. Potassium nitrate

Question 23:

• JAMB 1982

If atom X with six electrons in its outermost shell combines with atom Y with one electron in its outermost shell to form an ionic compound, then?

A. Six atoms of X will combine with one of Y
B. Two atoms of X will combine with six of Y
C. One atom of X will combine with two of Y
D. Two atoms of X will combine with one of Y
E. One atom of X will combine with six of Y

Question 24:

• JAMB 1982

The nitrogen gas obtained by burning an excess of phosphorus in air has a density higher than the nitrogen from nitrogen compounds because the nitrogen from air is contaminated with?

A. Some unburnt phosporus
B. P₂O₅ vapour
C. Some oxygen
D. Rare gases
E. Carbondioxide

Question 25:

• JAMB 1982

When air is passed through alkaline pyrogallol and then over quicklime, the only gases left are?

A. Nitrogen and carbondoxide
B. The rare gases
C. Nitrogen and oxygen
D. Nitrogen and the rare gases
E. Nitrogen, carbonioxide and the rare gases