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JAMB Chemistry Past Questions & Answers - Page 87

431.

The principle of column chromatography is based on th ability of the constituents to

A.

React with the solvent in the column

B.

React with each other in the solvent in the column

C.

Dissolve in each other in the column

D.

Move at different speeds in the column

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

432.

The monomer of nylon is

A.

Hydroxybenzene

B.

Hexanedioic acid

C.

Benzene -1,-4-dicarboxylic acid

D.

Ethane-1,2-diol

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

433.

In the laboratory preparation of chlorine from concentrated hydrochloric acid in the presence of potassuim tetraoxomanganate(VII) the produced is dried by passing it through

A.

Concentrated tetraoxosulphate (VI) acid

B.

Anhydrous calcium chloride

C.

Calcium oxide

D.

Sodium hydroxide

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

434.

The enzyme used in the hydrolysis of starch to dextrin and maltose is

A.

Zymase

B.

Sucrase

C.

Amylase

D.

Lactase

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

435.

An endothermic reaction is one during which heat is.....and can be represented by the symbol.... which of the following combinations can be used accurately to complete the above definition?

A.

liberated, - $\Delta$ H

B.

liberated, + $\Delta$ H

C.

absorbed, - $\Delta$ H

D.

absorbed, + $\Delta$ H

E.

absorbed, + $\Delta$ G

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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