IGCSE Chemistry Paper-1: Specimen Questions with Answers 33 - 34 of 99

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Question 33

Question

MCQ▾

With reference to the given 3 figures, physical state of element X changes from fig 2 to fig 1. What could be the possible process that must have taken place?

Three States of the Matter – Solid, Liquid and Gas

Choices

Choice (4)

a.

Vaporization

b.

Condensation

c.

Diffusion

d.

Ionization

Answer

b.

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 gaseous state changes to liquid.

Condensation is the change of water from its gaseous form (water vapour) into liquid water. Therefore answer will be C

Question 34

Question

MCQ▾

The nucleon number and proton number of the lithium atom are shown by the symbol 7Li3

What is the correct symbol for the lithium ion in lithium chloride?

Choices

Choice (4)

a.

7Li +3

b.

6Li +3

c.

6Li-2

d.

7Li-3

Answer

a.

Explanation

The electronic configuration of lithium and chlorine in lithium chloride can be shown as:

Electronic Configuration of Lithium and Chlorine

In lithium when the electron will be lost (it will be always last if only one is lost) , then there will be only 2 electrons left which will become outermost shell electron and make the shell complete because the electron will be of s-orbital and that can contain a maximum of 2 electrons, so outermost orbit is filled.

Similarly Chlorine will take one electron from lithium to complete its octet.

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