IGCSE Chemistry: Specimen Questions with Answers 180 - 182 of 240

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Question 180

Statement

True-False▾

elements neither gain nor lose electrons.

Answer

TRUE

Explanation

Group elements contain electrons in their valence shell. Hence they neither gain nor lose electrons while forming compounds. Instead, they share electrons.

Question 181

Question

MCQ▾

Which columns describe the hydrocarbons ethane and ethene?

Hydrocarbons Ethane and Ethane

Choices

Choice (4)

a.

1 (ethane) and 2 (ethene)

b.

1 (ethane) and 4 (ethene)

c.

2 (ethene) and 3 (ethane)

d.

3 (ethane) and 4 (ethene)

Answer

a.

Explanation

Correct option is A because physical state of ethane is gas and when it comes in contact with oxygen then it would burn but there is no reaction when it react with aqueous bromine. Ethane physical state is gas it also burn when it comes in contact with oxygen but it would turn transparent when it react with aqueous bromine as shown in figure.

Image Result for Reaction with Aqueous Bromine of Ethane

Question 182

Write in Short

Short Answer▾

Impure water needs to be treated if it is to be used in the home.

Complete the diagram below to show the electron arrangement in a water molecule.

Electron Arrangement

Explanation

As shown in the figure.

Image Result of Electron Arrangement
Image Result of Electron Arrangement 1

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