A black compound of manganese reacts with a halogen acid to give a greenish yellow gas. When excess of this gas reacts with NH3, an unstable trihalide is formed. In this process, the oxidation state of nitrogen changes from :
A
−3 to +3
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B
−3 to 0
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C
−3 to +5
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D
0 to −3
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Solution
The correct option is D−3 to +3 The black compound is MnO2.