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Give reasons for the following: (i) Ox...

Give reasons for the following:
(i) Oxygen is a gas but sulpher is a solid.
(ii) `O_(3)` acts as a powerful oxidising agent.
(iii) `BiH_(3)` is the strongest reducing agent amongst all the hydrides of Groups 15 elements.

Text Solution

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Ozone is an unstable compound under normal conditions and decomposes readily on heating to give a molecule of oxygen `(O_(2))` and nascent oxygen (O). Nascent oxygen, being a free radical, is very reactive. Therefore, ozone acts as a powerful oxidising agent and it is more reactive than oxygen.
`underset("Ozone")(O_(3)) overset(UV)to underset("molecule")underset("Oxygen")(O_(2)) +underset("free radical")underset("Oxygen")(O^(•))`
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