Home / iGCSE Chemistry (0620) Core:8.5 Noble gases: Exam Style Questions Paper 1

iGCSE Chemistry (0620) Core:8.5 Noble gases: Exam Style Questions Paper 1

iGCSE Chemistry (0620) Core Paper 1 - All Chapters
Question

Which diagram shows a mixture of noble gases?

A) 

B) 

C) 

D) 

▶️ Answer/Explanation
Solution

Ans: A

Noble gases are monatomic elements that don’t form molecules or compounds with each other. A mixture of noble gases would show individual atoms of different noble gas elements (like helium, neon, argon) mixed together without any chemical bonding between them. This is best represented by diagram A.

The other diagrams likely show either compounds (where atoms are bonded together) or pure elements rather than mixtures.

Question

Three properties of element X are listed.
● It contains atoms with a full outer shell of electrons.
● It is monoatomic.
● It is unreactive.
In which part of the Periodic Table is the element placed?

A. Group I
B. Group VII
C. Group VIII
D. transition elements

▶️Answer/Explanation

Ans:

C

All these properties correspond to noble gases in group VIII.

Question

 A flammable gas needs to be removed from a tank at an industrial plant. For safety reasons, an inert gas is used.
Which gas is suitable?

A argon

B hydrogen

C methane

D oxygen

▶️Answer/Explanation

Ans:A

Argon is a noble gas which is inert.

 

Question

A balloon is filled with helium. Helium is a noble gas and makes the balloon rise up in the air.
The density of air is $1.23 \mathrm{~g} / \mathrm{dm}^3$.
Which gas is helium?

▶️Answer/Explanation

Ans:B

It is lighter than air. Its density is $0.179 \mathrm{~g} / \mathrm{dm}^3$. It is an inert gas and hence does not react with oxygen.

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