CIE Chemistry (US-0439): Specimen Questions with Answers 192 - 194 of 240

Question number: 192

Short Answer Question▾

Write in Short

The table shows some physical properties of the Group VII elements.

some physical properties of the Group VII elements

Some Physical Properties of the Group VII Elements

some physical properties of the Group VII elements

Describe the color of chlorine.

……………………………………………………………………………………………………………….

Explanation

The halogens darken in colour as the group is descended: thus, while fluorine is a pale yellow gas, chlorine is distinctly yellow-green.

Question number: 193

MCQ▾

Question

Those hydrocarbons in which all the carbon atoms are single bonded to each other are known as ________.

Choices

Choice (4) Response

a.

Alkene

b.

Alkane

c.

Alkyne

d.

None of the above

Answer

b.

Explanation

Hydrocarbons are the compounds of carbon and hydrogen. Those hydrocarbons in which all the carbon atoms are singly bonded to each other are known as alkanes.

Some examples of alkanes are methane , ethane , propane etc.

The structure of propane is:

Image of the structure of propane

Image of the Structure of Propane

Image of the structure of propane

It can be seen easily that all the carbon atoms present in propane are bonded to each other by single bonds.

Question number: 194

Short Answer Question▾

Write in Short

Which physical property is used to distinguish between metals and non-metals? It is possessed by all metals but by only one non-metal.

Explanation

Boiling point is the physical property.

Tungsten (metal) selenium (non-metal) are the elements with highest boiling point. .