Q. 235.0( 1 Vote )

A black compound A. – 3 to +3

B. – 3 to 0

C. – 3 to +5

D. 0 to – 3

Answer :

when a black compound of manganese reacts with a halogen the following reaction takes place:


MnO2 + 4HCl MnCl2 + 2H2O + Cl


A greenish yellow gas is produced, it means that chlorine is liberated during the reaction


When excess of Cl2 reacts with ammonia:


NH3 + 2Cl2NCl3 + 3HCl


Oxidation state of nitrogen in NH3 can be calculated by


Let the oxidation state of N is x.


X + 3*(+1) = 0, x = -3


Oxidation state of NCl3 can be calculated by


X + 3*(-1) = 0, x = +3


Therefore oxidation state of nitrogen varies from -3 to +3.


Hence the correct option is (i).

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