1.

A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with NH_(3) an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from .......... .

Answer»

`-3` to + 3
`-3` to 0
`-3` to + 5
0 to -3

Solution :`UNDERSET(("BLACK"))(MnO_(2))+4HCL rarr MnCl_(2) + 2H_(2)O + underset(("GREENISH yellow gas"))(Cl_(2))`
`overset(-3)(NH)_(3)+ 3Cl_(2) rarr overset(+3)(NCl)_(3)+3HCl`


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