A black compound of manganese reacts with a halogen acid to give 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 _________.
(i) - 3 to +3
(ii) - 3 to 0
(iii) - 3 to +5
(iv) 0 to - 3
NCERT Class XII
Chemistry - Exemplar Problems
Chapter 7. The p-block elements
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NH3+3Cl2=NCl3+3HCL (-3 changes to +3)
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