JAMB Chemistry Past Questions & Answers - Page 80

396.

The diagram represents

A.

A spontaneous reaction

B.

An exothermic reaction

C.

A non-spontaneous

D.

An endothermic reaction

Correct answer is B

No explanation has been provided for this answer.

397.

In the diagram above, X is the

A.

Enthalphy

B.

Activated complex

C.

Activation energy

D.

Enthalphy change

Correct answer is D

No explanation has been provided for this answer.

398.

n monosaccharide \( \underset{Q}{\stackrel{P}{\rightleftharpoons}} \) polysaccharide -n water.

In the process above, P and Q respectively represent

A.

Condensation and hydrolysis

B.

Fermentation and condensation

C.

Polymerization and hydrolysis

D.

Polymerization and condensation

Correct answer is A

No explanation has been provided for this answer.

399.

The compound above exhibits

A.

Geometric isomerism

B.

Positional isomerism

C.

Structural isomerism

D.

Optical isomerism

Correct answer is D

Optical isomers are molecules that are non-superimposable mirror images of each other and they are not identical. Molecules with a chiral carbon show this kind of isomerism. Chiral carbon, also known as asymmetric carbon, refers to carbon atom that are bonded to four different atoms or groups of atoms.

400.

MnO\(_4\)(aq) + Y + 5Fe\(^{2+}\) (aq) \(\mapsto\) Mn\(^{2+}\) (aq) + 5Fe\(^{3+}\) (aq) + 4H\(_2\)O (l).

In the equation above, Y is

A.

10H+ (aq)

B.

5H+ (aq)

C.

8H+ (aq)

D.

4H+ (aq)

Correct answer is C

No explanation has been provided for this answer.