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Home » A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When an excess of this gas reacts with NH3 an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from _________.
A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When an excess of this gas reacts with NH3 an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from _________.
CBSE | Chemistry | Class 12 | Exercise 1 | NCERT Exemplar | The P-Block Elements
A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When an 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

 

Correct Answer: (i) –3 to +3

Explanation: A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When an excess of this gas reacts with NH3 an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from –3 to +3.

Reaction Involved:-

MnO2 + 4HCl → MnCl2 + Cl2 ​​↑+ 2H2​O

NH3 ​+ 3Cl2 ​​→ NCl3 ​+ 3HCl

 

i

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