Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 36:

• JAMB 1984

Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over

A. Potassium hydroxide
B. Heated gold
C. Heated magnesium
D. Heated phosphorus
E. Calcium chloride

Question 37:

• JAMB 1985

When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to?

A. Convection currents
B. Small changes
C. Small changes in temperature
D. A chemical reaction between the pollen grain and water
E. The bombardment of the pollen grains by molecules of water

Question 38:

• JAMB 1985

Which of the following compounds is NOT the correct product formed when the parent metals is heated in air?

A. Calcium oxide (CaO)
B. Sodium oxide (Na₂O)
C. Copper (ll) oxide (CuO)
D. Tri-iron tetroxide (Fe₃O₄)
E. Aluminium oxide (Al₂O₃)

Question 39:

• JAMB 1986

When steam is passed through red hot carbon, which of the following are produced?

A. Hydrogen oxygen and carbon (IV) oxide
B. Hydrogen and carbon (IV) oxide
C. Hydrogen and carbon (II) oxide
D. Hydrogen and trioxocarbonate (IV) acid

Question 40:

• JAMB 1986

Which of the following will react further with oxygen to form higher oxide?

A. NO and H₂O
B. CO and CO₂
C. SO₂ and NO
D. CO₂ and H₂O