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Question
A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When excess of this gas reacts with \[\ce{NH3}\] an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from ______.
Options
– 3 to +3
– 3 to 0
– 3 to +5
0 to – 3
Solution
A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When excess of this gas reacts with \[\ce{NH3}\] an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from – 3 to +3.
Explanation:
\[\ce{\underset{(Black)}{Mno2} + 4HCl -> MnCl2 + \underset{(Greenish yellow gas)}{2H2O} + Cl}\]
When excess of \[\ce{Cl2}\] reacts with \[\ce{NH3}\] the products are \[\ce{NCl3}\] and \[\ce{HCl}\].
\[\ce{NH3 + 3Cl2 -> NCl3 + 3HCl}\]
\[\ce{O.S. (-3) O.S. (+3)}\]
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RELATED QUESTIONS
Write chemical formula of the following oxoacids of chlorine:
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b. Chlorous acid
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d. Perchloric acid
Account for the following :
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(1) HClO4
(2) H3PO3
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\[\ce{HClO < HClO2 < HClO3 < HClO4}\]
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