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  4. Assertion: Ozone is an allotrope of oxygen. Reason: Oxygen is bluish colour liquid and in singlet state it is more paramagnetic.

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Q. Assertion: Ozone is an allotrope of oxygen.
Reason: Oxygen is bluish colour liquid and in singlet state it is more paramagnetic.

AIIMSAIIMS 2007The p-Block Elements - Part2

Solution:

Oxygen is a colourless, odourless and tasteless gas. It is paramagnetic in gaseous, liquid and solid states. It can be liquefied to a pale blue liquid by compressing the gas at a very low temperature. Its allotropic modification is ozone.