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SAI INTERNATIONAL SCHOOL
Class - VI
Subject - Chemistry
Topic – Air Around Us
Sub-Topic – Composition of air - Nitrogen, oxygen and Carbon dioxide

Practice Worksheet

Q. No. Questions Marks Skill
Q. 1 Air cannot be _________but we can ________it. 1 R

Q. 2 Who discovered oxygen? 1 R
Q. 3 DIRECTION: Each of these questions contains an Assertion followed 1 U
by Reason. Read them carefully and answer the question based onthe
following options. You have to select the one that best describes the
two statements.
(a) If both Assertion and Reason are correct and Reason is the correct
explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the
correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect

Assertion (A)-Air contains 3.03% of carbon dioxide.

Reason(R)- Carbon dioxide helps in photosynthesis...

Q. 4 1 U
Assertion (A)- When we blow a balloon, it increases in size.

Reason(R)- It happens as air has mass.

Q. 5 The gas used in the electric bulb is also present in the air in a small 1 Hots
amount is……..
a) Carbon dioxide.
b) Hydrogen.
c) Neon.
d) Oxygen.
Q. 6 Air is a mixture of different types of gases. They are 1 U
a) Nitrogen, oxygen, chlorine.
b) Oxygen, argon, carbon dioxide.
c) Nitrogen, carbon, oxygen.
d) Oxygen, methane, carbon.
Q. 7 The presence of this gas in air is 78 % 1 R
a) Hydrogen.
b) Oxygen.
c) Carbon dioxide.
d) Nitrogen.
Q. 8 Is air regarded as a matter? Justify. 3 Hots

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