JAMB Past Questions and Answers - Page 1373

6,861.

An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is

A.

16

B.

15

C.

31

D.

46

Correct answer is B

No explanation has been provided for this answer.

6,863.

An example of a solid emulsion is

A.

Butter

B.

Hair cream

C.

Milk

D.

Cod-liver oil

Correct answer is A

No explanation has been provided for this answer.

6,864.

In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is

A.

Blue

B.

Red

C.

Orange

D.

Purple

Correct answer is D

Neutral litmus paper is purple.  the result of a neutralization reaction is salt and water and hence is neutral.