IGCSE Chemistry Paper-1: Specimen Questions with Answers 42 - 43 of 99

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Question 42

Question

MCQ▾

The diagrams show the arrangement of particles in three different physical states of substance X.

Which statement about the physical states of State A and State C is correct?

Three States of the Matter

Choices

Choice (4)

a.

State A changes to state C by Freezing

b.

State A changes to State C by Melting.

c.

State A changes to State C by vaporization

d.

State A changes to state C by Deposition

Answer

a.

Explanation

The above three figures clearly state that Figure 1 is a liquid substance, Fig 2 is a gas and Fig 3 is a solid.

Therefore it can be seen that a liquid state is changing to a solid state.

Freezing is the process by which a liquid state changes to solid state.

Question 43

Question

MCQ▾

On moving down in group in periodic table which one of the following does not increase?

Choices

Choice (4)

a.

Valence

b.

Atomic radius

c.

Metallic character

d.

No of shells

Answer

a.

Explanation

The elements in the same group going from top to down have the same kind of electronic configuration. Consider in group 1 from top to bottom,

H = 1

Li = 2,1

Na = 2,8, 1

And so on.

We can see that the valence electron number remains the same as we move down in a group.

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