JAMB Chemistry Past Questions & Answers - Page 127

631.

The diagram above is the solubility curve of a solute, X. Find the amount of X deposited when 500cm3 of a solution of X is cooled from 60oC to 20oC.

A.

0.750 mole

B.

0.950 mole

C.

2.375 moles

D.

4.750 moles

Correct answer is A

No explanation has been provided for this answer.

632.

Which of the compounds above would react to take up two molecules of bromine durng bromination?

A.

l only

B.

lll only

C.

l and ll only

D.

ll and lll only

Correct answer is C

No explanation has been provided for this answer.

633.

In the diagram above, the mixture of the solids P and Q can be separated by?

A.

distillation

B.

fractional distillation

C.

crystallization

D.

fractional crystallization

Correct answer is D

The process involves a series of repeated-crystallizations.

634.

Use the table above to answer this question .The least reactive element is

A.

W

B.

X

C.

Y

D.

Z

Correct answer is D

No explanation has been provided for this answer.

635.

Use the table above to answer this question . The element that is likely to participate in covalent rather than ionic bonding is

A.

Z

B.

Y

C.

X

D.

W

Correct answer is C

the element likely to participate in covalent rather than ionic bonding is X, covalent bonding is a type of bonding that involves the participants contributing an equal number of electrons into a shared pair.