MCQ Questions

Question No. 1

Give one word for each statement.

Answer :

a) The electron distribution of an atom

b) Group 17 elements of the Periodic Table of elements

c) The ability of a neutral atom to attract a bonding electron pair

d) The process used in industry to prepare chlorine

e) An oxidising agent that can be used in the laboratory preparation of chlorine

Question No. 2

The halogens are found in Group 17 of the Periodic Table.

Answer :

a) How many valence electrons does a halogen have?

b) How many unpaired electrons does a halogen have?

c) Give the electron configuration for chlorine.

d) What is the normal valency of the halogens?

Question No. 3

Why don’t we find elemental chlorine in nature?

Answer :

Question No. 4

Complete the table below.

Answer :

Formula

State at STP

Appearance

a) Fluorine

b) Chlorine

c) Bromine

d) Iodine

Name

Question No. 5

How does the magnitude of reactivity change within the group of the halogens?

Answer :

a) Magnitude of reactivity

b) Colour intensity change within Group 17

Question No. 6

Write balanced equations for the following reactions:

Answer :

a) Bromine with hydrogen

b) Fluorine with sodium

c) Chlorine with magnesium

d) Boron with fluorine

e) Iodine with nitrogen

Question No. 7

When iron reacts with chlorine gas, a yellow glow can be seen. Dark brown vapours of iron(III) chloride are formed.

Answer :

a) Is this reaction exothermic or endothermic? Give a reason for your answer.

b) Write a balanced equation for the reaction.

Question No. 8

Magnesium and iodine powders are mixed on a heat-resisting plate.

Answer :

a) What would you do to initiate the reaction? Give a reason for your answer.

b) Describe what you would see during the reaction.

c) Write a balanced equation for the reaction.

Question No. 9

Chlorine water is added to an unknown halide solution. The solution turns brown. When tetrachloromethane is added to the solution, the solution turns purple.

Answer :

a) Name the unknown halide, and explain your choice.

b) Write a balanced equation for the displacement reaction that took place.

c) Explain why halogens dissolve better in tetrachloromethane than in water.

d) Give the activity series for the halogens.

Chapter

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