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Railways PYQCBT 2 2017

RRB NTPC · Question 118

The ozone molecule is made up of ______ atoms of oxygen.

  1. Three

  2. Four

  3. Five

  4. Six

Show answer & explanation

Answer: (A) Three

Explanation

Ozone (O₃) is made of three oxygen atoms; ordinary oxygen (O₂) has two.