Air - Jamb Chemistry Past Questions and Answers

Question 16:

• JAMB 1995

Helium is often used in observation balloons because it is?

A. Light and combustible
B. Light and non-combustible
C. Heavy and combustible
D. Heavy and non-combustible

Question 17:

• JAMB 1997

200 cm³ of air was passed over heated copper in a syringe several times to produce copper (II) oxide.
When cooled, the final volume of air recorded was 158cm³. Estimate the percentage of oxygen in the air?

A. 31%
B. 27%
C. 21%
D. 19%

Question 18:

• JAMB 1997

Which of the following gases is the most dangerous pollutant?

A. Hydrogen sulphide
B. Carbon (lV) oxide
C. Sulphur (lV) oxide
D. Carbon (ll) oxide

Question 19:

• JAMB 1998

The property used in obtaining oxygen and nitrogen industrially from air is the?

A. Boiling point
B. Density
C. Rate of diffusion
D. Solubility

Question 20:

• JAMB 1999

Which of the following will have its mass increased when heated in air?

A. Helium
B. Magnesium
C. Copper pyrites
D. Glass