Question

Which of the following is not true about Ozone?

• A. It is a pale blue gas with a characteristic strong smell
• B. It is unstable and decomposes completely into oxygen at ${30}^{0}C$ with the absorption of 68 kCal/mol.
• C. It is diamagnetic in nature.
• D. It is powerful oxidizing agent

Answer 1

The correct option is B It is unstable and decomposes completely into oxygen at ${30}^{0}C$ with the absorption of 68 kCal/mol.

a) The colour of ozone is pale blue and has a characteristic strong smell.
b) Though it is unstable but the decomposition is exothermic in nature.
c) Each of three oxygen atom in $O_3$ will contribute $6$ electrons and so no unpaired electron, hence it is diamagnetic in nature.
d) $O_3$ readily decompose to give a nascent oxygen atom which is more reactive than oxygen. Thus it is a powerful oxidising agent.