Question

Both ${\mathrm{CO}}_2\mathrm{and}{\mathrm{H}}_2$ gases are

• A. Heavier than air
• B. colourless
• C. Acidic in nature
• D. soluble in water

Answer 1

The correct option is B

colourless

Explanation for correct option:

(B) Colourless.

Properties of ${\mathrm{CO}}_2$:

• ${\mathrm{CO}}_2$Carbon dioxide is a greenhouse gas.
• ${\mathrm{CO}}_2$ is a colourless gas
• ${\mathrm{CO}}_2$ is acidic in nature because when it is dissolved in water it gives carbonic acid which is a weak acid.
• ${\mathrm{CO}}_2$ is highly soluble in water.
• ${\mathrm{CO}}_2$ is heavier than air
• Carbon dioxide is heavier than dry air.

Properties of ${\mathrm{H}}_2$:

• ${\mathrm{H}}_2$ is a colourless gas
• ${\mathrm{H}}_2$ is not acidic in nature
• ${\mathrm{H}}_2$ is not soluble in water.
• ${\mathrm{H}}_2$ is less heavy than air.
• Hydrogen can be used in fuel cells to generate electricity, or power and heat.

Hence, both ${\mathrm{CO}}_2$ and ${\mathrm{H}}_2$ have the same property of being a colourless gas. So, this is the correct option.

Explanation for incorrect option:

(A) Heavier than air.

• According to the properties of the above gases, one gas is heavier and another one is lighter than air. So, this is an incorrect option.

(C) Acidic in nature:

• According to the properties of the above gases, ${\mathrm{CO}}_2$ is acidic in nature and hydrogen gas is not acidic. So, this is an incorrect option.

(D) soluble in water:

• According to the properties of the above gases, ${\mathrm{CO}}_2$ is soluble in water and hydrogen gas is not soluble. So, this is an incorrect option.

Hence, ${\mathrm{CO}}_2\mathrm{and}{\mathrm{H}}_2$gases are colorless which is the correct option (B).