WAEC Chemistry Past Questions & Answers - Page 70

346.

Consider the following equilibrium system:
2SO2(g) + O2(g) \(\rightleftharpoons\) 2SO3(g)

The addition of more O2(g) to the system will shift the equilibrium position to the

A.

Right leading to the production of more SO3(g)

B.

Right leading to the production of more SO2(g)

C.

Left leading to the production of more SO2(g)

D.

Left leading to the production of more SO3(g)

Correct answer is A

No explanation has been provided for this answer.

347.

The correct balanced equation for the reaction between aluminium metal and hot concentrated tetraoxosulphate(VI)acid is ?

A.

2AI(s) + 6H2SO4(1) \(\to\) AI2(SO4)3(aq) + 6H2O(1) + 3SO2(g)

B.

2AI(s) + 3H2SO4(1) \(\to\) AI2(SO4)3(aq) + 6H2O(1) + 3SO2(g)

C.

2AI(s) + 4H2SO4(1) \(\to\) AI2(SO4)3(aq) + 8H2O(1) + 3SO2(g)

D.

2AI(s) + 5H2SO4(1) \(\to\) AI2(SO4)3(aq) + 8H2O(1) + 3SO2(g)

Correct answer is A

No explanation has been provided for this answer.

348.

Which of the following gases is monoatomic?

A.

Argon

B.

Chlorine

C.

Nitrogen

D.

Oxygen

Correct answer is A

No explanation has been provided for this answer.

349.

Which of the following polymers in thermosetting?

A.

Bakelite

B.

Nylon

C.

Polypropene

D.

Polystyrene

Correct answer is A

No explanation has been provided for this answer.

350.

Which of the following products of biotechnology can be used as a fuel in place of petrol?

A.

Butane

B.

Ethanol

C.

Ethene

D.

Propanol

Correct answer is B

Ethanol can be used as a fuel in place of petrol. it is commonly produced through biotechnology processes such as the fermentation of sugars from crops like corn or sugarcane. Ethanol is used as a biofuel and can be blended with gasoline to create ethanol-gasoline blends.