Samacheer Kalvi Class 8 Science Air Questions - 1

Question: 1

Lighter metals like Na, K, combine with CO₂ to form corresponding ______

(A) Carbonates

(B) Oxide

(C) Nitrates

(D) None

Question: 2

Tri oxygen molecule is known as _____

(A) Ozone

(B) Nitrogen

(C) Oxygen

(D) Hydrogen

Question: 3

Which of the following is known as azote?

(A) Carbon dioxide

(B) Sulphur

(C) Nitrogen

(D) Oxygen

Question: 4

Which of the following is true about oxygen?

(A) Supports burning

(B) Doesn't support burning

(C) Partially burning gas

(D) Completely burning gas

Question: 5

_____ is necessary for all acids.

(A) Oxygen

(B) Nitrogen

(C) Hydrogen

(D) Carbon oxide

Question: 6

Carbon dioxide gas is ______

(A) As heavy as air

(B) Lighter than air

(C) Heavier than air

(D) None of these

Question: 7

Solvay process is a method to manufacture

(A) Aerated water

(B) Sodium carbonate

(C) Distilled water

(D) Lime water

Question: 8

A gas which is used to remove carbon impurities from steel.

(A) Oxygen

(B) Carbon dioxide

(C) Hydrogen

(D) Nitrogen

Question: 9

_____ gas is essential for the proper growth of all plants.

(A) Oxygen

(B) Carbon dioxide

(C) Nitrogen

(D) None

Question: 10

Aerated water contains

(A) Carbon dioxide

(B) Nitrogen

(C) Oxygen

(D) Air