JAMB Chemistry Past Questions & Answers - Page 150

746.

The general formula of haloalkanes where X represents the halide is

A.

Cn H 2n-1X.

B.

C nH 2nX.

C.

C nH 2n+2 X

D.

C nH 2n+1X

Correct answer is D

No explanation has been provided for this answer.

748.

A compound that gives a brick-red colour to a non-luminous flame is likely to contain

A.

copper ions

B.

sodium ions

C.

calcium ions

D.

Potassium ions

Correct answer is C

No explanation has been provided for this answer.

749.

In the electrolytic extraction of calcium from calcium chloride, the cathode is

A.

zinc

B.

graphite

C.

platinum

D.

iron

Correct answer is D

No explanation has been provided for this answer.

750.

In the extraction of sodium from fused sodium chloride, the anode is made of platinum because

A.

sodium is formed at the anode

B.

chlorine is formed at the anode

C.

sodium does not react with platinum

D.

chlorine does not react with platinum

Correct answer is D

Because platinum is resistant to chlorine and water, hence in the electrolytic process, it doesn't react with any chemical and we get pure products.