IGCSE Chemistry Paper-1: Specimen Questions with Answers 24 - 25 of 99

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Question 24

Question

MCQ▾

Which two elements react together to form an ionic compound?

Various Elements with Electronic Structure
elementelectronic structure
R2,4
T2,8
X2,8, 1
Z2,8, 7

Choices

Choice (4)

a.

Z and R

b.

R and T

c.

T and X

d.

X and Z

Answer

d.

Explanation

From the above table it is clear X (2,8, 1 = Sodium) and belongs to group 1 of periodic table. Whereas Z (2,8, 7 = Chlorine) belong to Group 17, the halogen group. All the halogens exist as diatomic molecules. They have high ionization energies and form the most electronegative group of elements. Their electron configuration, ns2np5, allows them to easily react with Group 1 and 2 metals; each halogen tends to pick up one electron, and the Group 1 and Group 2 elements each tend to lose one or two electrons.

Question 25

Question

MCQ▾

Which structure is incorrect?

Choices

Choice (4)

a.

Configuration of Carbon and Hydrogen – Choice A

b.

Configuration of Carbon and Hydrogen – Choice B

c.

Configuration of Carbon and Hydrogen – Choice C

d.

Configuration of Carbon and Hydrogen – Choice D

Answer

c.

Explanation

The electronic configuration of carbon is (2,4) and that of hydrogen is 1.

In Figure C, C have four electrons to bond with. If it bonds with three H atoms then there is no possibility to combine with two C atoms. Therefore C is incorrect.

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