IGCSE Chemistry: Specimen Questions with Answers 110 - 112 of 240

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Question 110

Question

MCQ▾

As we move down a particular group, the number of ________ changes.

Choices

Choice (4)

a.

Shell

b.

Chemical

c.

Physical

d.

All of the above

Answer

c.

Explanation

As we move down a particular group, the number of “shells” changes.

The number of valence electrons remains the same as we move down a particular group. But the number of shells keeps on increasing successively, i.e.. one by one, as we move down the group.

Valence Electrons Remains the Same as We Move Down

Question 111

Write in Short

Short Answer▾

How would the color of the gas inside the syringe change? Give an explanation for your answer.

Equilibrium Mixture Syringe

Explanation

A equilibrium mixture syringe is filled. The effect of pressure on the equilibrium is shown to be in accordance with Le Chatelier՚s principle by compressing the mixture and observing the change in colour intensity. Similarly, the effect of temperature is demonstrated by heating or cooling the mixture and observing the change in colour, or the change in volume of the mixture compared with that of a similar volume of air.

Question 112

Write in Short

Short Answer▾

The structures of five atoms, A, B, C, D, and E, are shown below.

Structures of Five Atoms

Answer the following questions about these structures. Each structure can be used once, more than once or not at all.

Which structure represents an atom of a metal?

Explanation

Correct option is C because metal always donate the electron from its valence shell and option C have e- in its outermost shell so it want to become stable so it will donate one electron from its valence shell. And this electronic configuration represent Lithium metal.

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