Question

Both CO₂ and H₂ gases are:

• A. Heavier than air
• B. Acidic in nature
• C. Colorless
• D. Soluble in water

Answer 1

The correct option is C

Colorless

The explanation for the correct option:-

(C) Both CO₂ and H₂ are colorless in nature.

Hydrogen(H₂):

1. It is the first element in the periodic table.
2. It is formed by diatomic molecules, H₂.
3. Its atomic number is 1.
4. Its atomic weight is 1.00784 u.
5. It is a highly inflammable gas.

Carbon dioxide(CO₂):

1. It is a chemical compound and acidic in nature.
2. Its density is higher than that of air about 53%.
3. It consists of a carbon atom covalently double bonded to two oxygen atoms.
4. It is non-flammable gas at a normal temperature and pressure.
5. It is formed during respiration, photosynthesis, and combustion of fuels.

The explanation for the incorrect option:-

(A) Heavier than air

CO₂ is heavier than air whereas H₂ is less heavy than air.

(B) Acidic in nature

CO₂ is acidic in nature but H₂ is not acidic in nature.

(D) Soluble in water

CO₂ is highly soluble in water as compared to H_2.

Therefore, both CO₂ and H₂ are colorless gases and hence Option C is correct.