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NH(3) + O(2) overset("Pt")underset(Delta...

`NH_(3) + O_(2) overset("Pt")underset(Delta)(to) A + H_(2) O`
`A + O_(2) to B`
`B + H_(2) O to C + D`
A , B , C and D respectively are

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`4NH_(3)+5O_(2)underset(Delta)overset("Pt")to4NO+6H_(2)O`
`NO+1//20_(2) toNO_(2)`(brown fumes)
`NO_(2)+H_(2)O to HNO_(2)+HNO_(3)`(both oxoacids)
`2HNO_(2)+2I^(-) + 2H^(+)toI_(2) ("violent vapours")+2NO+2H_(2)O`.
So `( A)=NO, (B)=NO_(2), (C )=HNO_(2), (D)=HNO_(3)` and `(E)=I_(2)`
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