Chemistry Past Questions and Answers

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 12:

The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?

A CO and SO₃
B CO and SO₂
C CO,SO₂ and SO₃
D CO and H₂S

Question 13:

Oxygen-demanding waste are considered to be a water pollutant because they?

A Deplete oxygen which is necessary for the survival of aquatic organism
B Increase oxygen which is necessary for survival of aquatic organism
C Increase other gaseous substances which are necessary for the survival of aquatic organisms
D Deplete other gaseous species which is necessary for the survival of aquatic organisms

Question 14:

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

Question 15:

In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?

A H and S;Cl
B H and O;Cl
C H and S;C and O
D H and Cl;S and O