CIE Chemistry Paper-1: Specimen Questions 45 - 47 of 99

Question number: 45

MCQ▾

Question

An atom has electronic configuration of 2, 8, 7. Find atomic number and its group?

Choices

Choice (4) Response
a.

17, VII

b. 17, VI
c.

15, VI

d.

15, VII

Answer

a.

Explanation

We have an atom with electronic configuration of 2, 8, 7.

By adding 2 + 8+7 = 17, we will get the atomic number.

Electronic configuration of the element will be 1s2 2s2 2p6 3s23p5

Adding 2 + 5 = 7

Therefore the group will be VII.

Question number: 46

MCQ▾

Question

The structures of three compounds are shown.

tructure of three different compounds

tructure of three different compounds

Understanding the structure of compounds and finding homologous series

Why do these all lie in same homologous series?

Choices

Choice (4) Response
a.

They are all saturated.

b.

They all contain an even number of carbon atoms.

c.

They all contain the same functional group.

d.

They are all hydrocarbons.

Answer

c.

Explanation

Homologous series is a series of compounds with the same general formula, usually varying by a single parameter—such as the length of a carbon chain. Compounds within a homologous series typically have a fixed set of functional groups that gives them similar chemical and physical properties

The name “homologous series” is also often used for any collection of compounds that have similar structures or include the same functional group.

Question number: 47

MCQ▾

Question

Find correct statement regarding displacement reaction?

Choices

Choice (4) Response
a.

Displacement reaction is one in which one part of a molecule is displaced by other.

b.

Displacement reaction is one in which two or more elements combines together to form a single compound

c.

placement reaction is the loss of electrons by a molecule

d.

Displacement reaction is the loss of electrons by a molecule

Answer

a.

Explanation

Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions.

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