Molecules in Class 9 Science : Practice MCQ Questions & Answers with Explanations

2 practice sets · Page 1 of 1

1.

Which of the following is a diatomic molecule?

A

Oxygen (O₂)

B

Nitrogen (N₂)

C

Chlorine (Cl₂)

D

All of the mentioned

View Answer

Correct Answer: D — All of the mentioned

Explanation:

Oxygen, nitrogen, and chlorine all exist as diatomic molecules.

2.

Which of the following is a molecule made up of two identical atoms?

A

Water (H₂O)

B

Oxygen (O₂)

C

Methane (CH₄)

D

Carbon dioxide (CO₂)

View Answer

Correct Answer: B — Oxygen (O₂)

Explanation:

Oxygen molecules consist of two oxygen atoms bonded together.