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631. Ozone is an ______ form of oxygen.

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632.

Ozone oxidizes iodide to _______ and iodine to ________acid.

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633.

Sulphur acts a ___________ agent in vulcanization of sulphur.

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sulphuric acid

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635.

__________ is the radioactive halogen.

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636.

Of all the halogens, only _______ forms polyhalide ion.

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637.

Chlorine is liberated from hydrochloric acid in cold by the action of __________.

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638. Hydrogen Sulphide reduces hot concentrated sulphuric acid to _________ and hot concentrated nitri acid to _________.

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639.

On condensation, vapour of ________ phosphorus are converted to _________ phosphorus.

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640. State whether the following statements are true (T) or false (F):

Argon is the most abundant noble gas in the atmosphere.

Sulphur, phosphorus and oxygen are the element which shows allotropy.

XeF₄ molecule has a tetrahedral shape.

Among halogens, F₂ has a lowest bond dissociation enthalpy.

Among all the halogens, only iodine forms polyhalide ion.

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