CIE Chemistry (US-0439): Specimen Questions with Answers 27 - 30 of 240

Question number: 27

MCQ▾

Question

Number of shells in potassium is ________.

Choices

Choice (4) Response

a.

3

b.

4

c.

2

d.

1

Answer

b.

Explanation

Correct Answer is D because it has atomic number . And electronic configuration and are in period so it has number of shell.

Question number: 28

MCQ▾

Question

________ acid is used in aerated drinks.

Choices

Choice (4) Response

a.

Hydrochloric acid

b.

Carbonic acid

c.

Sulphuric acid

d.

Acetic acid

Answer

b.

Explanation

Carbonic acid is used in aerated drinks.

Question number: 29

MCQ▾

Question

Presence of Hydroxide ions in a solution suggests the presence of ________ in the solution.

Choices

Choice (4) Response

a.

Salt

b.

Base

c.

Acid

d.

None of the above

Answer

b.

Explanation

Presence of Hydroxide ions in a solution suggests the presence of base in the solution. ions indicate the presence of base.

Question number: 30

MCQ▾

Question

The diagram shows an experiment.

Images of experiment

Images of Experiment

Images of experiment

Choices

Choice (4) Response

a.

Image for pieces of litmus paper:Choice A

Image for Pieces of Litmus Paper: Choice A

Image for pieces of litmus paper

b.

Image for pieces of litmus paper:Choice B

Image for Pieces of Litmus Paper: Choice B

Image for pieces of litmus paper

c.

Image for pieces of litmus paper:Choice C

Image for Pieces of Litmus Paper: Choice C

Image for pieces of litmus paper

d.

Image for pieces of litmus paper:Choice D

Image for Pieces of Litmus Paper: Choice D

Image for pieces of litmus paper

Answer

c.

Explanation

Correct option is C because when we react with it gives as shown in figure. is basic while is neutral so whole solution is basic. Under basic solution Blue litmus is no color change and red litmus is changes its color to blue.

Image for Formation of Ammonia

Image for Formation of Ammonia

Image for Formation of Ammonia