Ncert Exercises & Solutions

A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When an excess of this gas reacts with ${NH}_{3}$ an unstable trihalide is formed. In this process, the oxidation state of nitrogen changes from-

1. –3 to +3

2. –3 to 0

3. –3 to +5

4. 0 to –3

Hint: In ammonia, the oxidation state of nitrogen is -3

Black coloured compound MnO₂ reacts with HCI to produce greenish yellow coloured gas of Cl₂

\underset{(Black)}{{MnO}_{2}} + 4 HCI \to {MnCl}_{2} + 2 H_{2} O + \underset{(greenish yellow gas)}{{Cl}_{2}}

Cl₂on further treatment with NH₃ produces NCl₃

\overset{- 3}{N} H_{3} + 3 {Cl}_{2} \to \overset{+ 3}{N} {Cl}_{3} + 3 HCl

NH₃ (- 3) changes to NCl₃(+3) in the above reaction. Hence, (a) is the correct choice.

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