JAMB Chemistry Past Questions & Answers - Page 211

1,051.

In which of the following pairs of element is allotropy exhibited by each element?

A.

Phosphorus and hydrogen

B.

Oxygen and chlorine

C.

Sulphur and nitrogen

D.

Oxygen and sulphur

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,052.

The best treatment for a student who accidentally poured concentrated tetraoxosulphate (VI) acid on his skin in the laboratory is to wash the skin with?

A.

cold water

B.

sodium hydroxide solution

C.

iodine solution

D.

sodium trioxocarbonate (IV) solution

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,053.

Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was?

A.

nitrogen

B.

chlorine

C.

oxygen

D.

sulphur (IV) oxide

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,054.

The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO2(g) + O2(g) ↔ 2SO3(g), ∆H = -196 kJ. What factor would influence increased production of SO3(g)?

A.

Addition of a suitable catalyst

B.

Increase in the temperature of the reaction

C.

Decrease in the temperature of the reaction

D.

Decrease in the concentration of SO2(g)

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,055.

When chlorine gas is passed into a solution of sulphur dioxide?

A.

sulphur dioxide is reduced to sulphur

B.

the chlorine is oxidized to hydrochloric acid

C.

dilute sulphuric acid and hydrochloric acid are produced

D.

Hydrochloric acid and sulphur are produced

E.

sulphur trioxide is the only product

View answer & explanation

Correct answer is C

- When sulfur (IV) oxide or sulfur dioxide is passed on with chlorine gas, mixture of acids are formed.

-  It leads to the formation of sulfuric acid and hydrochloric acid.

- This is a redox reaction


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