CIE Chemistry (US-0439): Specimen Questions with Answers 17 - 20 of 240

Question number: 17

MCQ▾

Question

The vertical columns in a periodic table are called ________.

Choices

Choice (4) Response

a.

Rows

b.

Group

c.

Question does not provide sufficient data or is vague

d.

None of the above

Answer

b.

Explanation

Correct option is B because the vertical columns in a periodic table are called group.

In the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families.

vertical columns of elements

Vertical Columns of Elements

vertical columns of elements

Question number: 18

MCQ▾

Question

Hydrocarbons are essentially made of ________.

Choices

Choice (4) Response

a.

Hydrogen and Carbon

b.

Hydrogen and Calcium

c.

Hydrogen and Cadmium

d.

None of the above

Answer

a.

Explanation

Hydrocarbons are essentially made of hydrogen and carbon.

Question number: 19

Short Answer Question▾

Write in Short

Classify each of the following as either an element, compound or mixture.

Carbon dioxide (1 Marks)

Explanation

A compound made up of molecules containing one carbon atom and two oxygen atoms is an carbon dioxide. Carbon dioxide is normally found as a gas that is breathed out by animals and absorbed by green plants.

Question number: 20

MCQ▾

Question

Among the following, the atom of which element is bigger in size?

Choices

Choice (4) Response

a.

Potassium

b.

Sodium

c.

Hydrogen

d.

Lithium

Answer

a.

Explanation

Potassium and lithium both belong to group .

Group 1 of the modern periodic table is as follows:

Potassium and lithium both belong to group 1

Potassium and Lithium Both Belong to Group 1

Potassium and lithium both belong to group 1

As the number of shells increases down the group the size of the atom also increases. Since potassium is below all listed elements, hence an atom of potassium is bigger in size than that of rest.