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The compound which could not act both as...

The compound which could not act both as oxidising and reducing agent is

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In `SO_(2)` the oxidation state of sulphur is `+4`. Since it can undergo an increase as well as decrease in its oxidation state, it can act both as oxidising and reducing agent. On the other hand, oxidation state of sulphur in `SO_(3)` is `+6` which is the maximum it can have. Since it can only decrease its oxidation state, sulphur trioxide `(SO_(3))` can act only as an oxidising agent.
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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -Questions From Board Examinations
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  8. PH(3) has lower boiling point that NH(3). Why ?

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  9. Why does PCl(3) fumes in air ?

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  10. Which set of elements have strongest tendency to form anions ?

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  11. Molecular shape of SF(4), CF(4) and XeF(4) are

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  18. Bond angle in NH(3) is more than in PH(3). Explain.

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