JAMB Chemistry Past Questions & Answers - Page 323

1,611.

Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?

A.

T

B.

W

C.

X

D.

Y

E.

Z

Correct answer is D

Y = 19 protons, 19 electrons and 20 neutrons.

Y has electronic configuration 2, 8, 8, 1. Hence, it has one valence electron in the outer shell (Valency of +1).

Mass number = protons + neutrons

= 19 + 20

= 39.

1,612.

with conc H2SO4 as catalyst
CH3COOH + C2H5OH → CH3COOC2H5 + H2O

A.

esterification

B.

Condensation

C.

saponification

D.

neutralization

Correct answer is A

No explanation has been provided for this answer.

1,613.

Which of the following statements is true about 2-methylpropane and butane

A.

They are not members of the same homologous series

B.

They have the same boiling point

C.

They have different number of carbon atoms

D.

They have the same chemical properties

Correct answer is D

No explanation has been provided for this answer.

1,615.

The functional groups present in the compound above are

A.

alkene and halo-group

B.

hydroxyl and chloro-group

C.

alkene and chloro-group

D.

hydroxyl and halo-group

Correct answer is D

No explanation has been provided for this answer.