1.

Which of the following elements (M) reacts with HNO_3" to form "MO_2 ?

Answer»

<P>`P_4`
Mg
Zn
Sn

Solution :`Sn+underset(("Hot and conc.""))(4HNO_(3) )to SnO_(2)+4NO_(2)+2H_(2)O`
(a). `P_(4)+underset(("Conc.""))(20 HNO_3)to 4H_(3)PO_(4)+20 NO_(2)+4H_(2)O`
(b). `underset(("very dilute"))(Mg)+HNO_(3) to Mg(NO_(3))_(2)+H_(2)`
(c). Zinc reacts with `HNO_(3)` in different ways.
`Zn+4HNO_(3) to Zn(NO_(3))_(2)+2NO_(2)+2H_(2)O`
`4Zn+10HNO)_3 to 4Zn(NO_(3))_(2)+N_(2)O+5H_(2)O`
`5Zn+12HNO_(3) to 5Zn(NO_(3))_(2)+N_(2)+6H_(2)O`
`4Zn+10HNO_(3) to 4Zn(NO_(3))_(2)+6H_(2)O+NH_(4)NO_(3)`


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