Chemistry questions and answers

Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

3,771.

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by?

A.

passing each gas through bromine water

B.

passing each gas through dilute potassium permanganate solution

C.

passing each gas through silver nitrate solution

D.

treating each gas catalytically with excess hydrogen gas

View answer & explanation

Correct answer is C

Acetylene reacts with ammoniacal AgNO3 solution to form a white precipitate of silver acetylide (AgC-=Cag) but ethylene does not

3,772.

Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of

A.

barium chloride solution

B.

dilute hydrochloric acide

C.

lead nitrate solution

D.

calcium chloride solution

E.

sodium hydroxide solution

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

3,773.

If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because

A.

both zinc and copper are metals

B.

the sulphate radical and the zinc ion are divalent

C.

zinc is more electropositive than copper

D.

both zinc and copper form depositive ions in solution

E.

zinc is a reducing agent

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

3,774.

Consider the following exothermic reaction
2SO2(g) + O2(g) ↔ 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then

A.

the reaction rate increases

B.

concentration of SO3 decreases

C.

concentration of SO3 increases

D.

SO2 gas becomes unreactive

E.

O3 gas becomes unreactive

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

3,775.

The most common type of chemical reaction which alkanes undergo is

A.

substitution

B.

addition

C.

condensation

D.

polymerisation

E.

double decomposition

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.


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