Dinitrogen pentoxide ,a colourless deliquescentsolid is ,prepared by

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A. reaction `NH_(4)NO_(3)` with an excess of oxygen
`(NH_(4)NO_(3)+2O_(2)rarrN_(2)O_(5)+2H_(2)O)`
B. dehydrating `HNO_(3)` with `P_(4)O_(10)` at a high temperature
`(4HNO_(3)+P_(4)O_(10)rarr4HPO_(3)+2N_(2)O_(5))`
C. dehydrating `HNO_(3)` with `CaO` at a high temperature
`(2HNO_(3)+CaOrarrN_(2)O_(5)+Ca(OH)_(2))`
D. reacting `NaNO_(3)` with `N_(2)O_(4)
(NaNO_(3)+N_(2)O_(4)rarrN_(2)O_(5)+NaNO_(2))`

Answer

2

Explanation

`N_(2)O_(5)`is prepared by distilling concentrated nitric with phosphorus pentoxide in a glass apparatus:
`{:(2HNO_(3) rarr H_(2)O+N_(2)O_(5)),(P_(2)O_(5)+H_(2)O rarr 2HPO_(3)),(bar(P_(2)O_(5)+2HNO_(3) rarr 2HPO_(3)+N_(2)O_(5))):}`
It is also prepared by the action of dry chlorine on solid silver nitrate at`95^(@)C`
`4AgNO_(3)+2Cl_(2)rarr 4AgCl +2N_(2)O_(5) + O_(2)`