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(a) What is the role of phosphorous pent...

(a) What is the role of phosphorous pentoxide in the preparation of `N_2 O_5` ?
(b) Phosphine is prepared in an inert atmosphere of `CO_2`. Why ?
( c) Red phosphorous is used for making matches. Why ?

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(a) `P_4O_10` acts as strong dehydrating agent. It removes water molecules from nitric acid, `HNO_3` to form `N_2 O_5`.
`P_4 O_10 + 12 HNO_3 rarr 4 H_3 PO_4 + 6 N_2 O_5`.
(b) Phosphine, being inflammable, burns in air. It is therefore prepared in an inert atmosphere.
( c) Red phosphorous is non-poisonous and has a high ignition point and hence red phosphorous is used for making matches.
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