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

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

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

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

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

Which of the following sulphides is insoluble in dilute HCl?

A. Na₂S

B. ZnS

C. CuS

D. FeS

When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?

A. HCl

B. HOCl

C. O₂

D. Cl₂O

A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H₂SO₄. Substance Z is?

A. NaHS

B. Na₂SO₃

C. Na₂S

D. NaHSO₃

Ammonia gas is normally dried with?

A. concentrated sulphuric acid

B. quicklime

C. anhydrous calcium chloride

D. magnesium sulphate

What are the values of x, y and z respectively in the equation: xCu + yHNO₃ → xCu(NO₃)₂ + 4H₂O + zNO?

A. 4: 1: 2

B. 3:8:2

C. 2:8:3

D. 8:3:2