(a) Account for the following :

(i) Helium is used in diving apparatus.

(ii) Fluorine does not exhibit positive oxidation state.

(iii) Oxygen shows catenation behaviour less than sulphur.

(b) Draw the structures of the following molecules :

(i) XeF2                                                (ii) H2S2O8

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#8 | 18th Group

Concept Questions :-

group 18,perparation and properties
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