Chemistry Past Questions and Answers

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 452:

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 453:

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 454:

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

Question 455:

Which of the following metals does NOT form a stable trioxocarbonate (IV)?

A Fe
B Al
C Zn
D Pb
E None of the options is correct