JCECE Engineering JCECE Engineering Solved Paper-2013

  • question_answer
    A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with \[N{{H}_{3}}\]an unstable trihalide is formed. In this process, the oxidation state of nitrogen changes from

    A) \[0\]to\[-3\]                      

    B) \[-3\]to\[0\]

    C)  \[-3\]to\[+5\]                  

    D)  \[-3\]to\[+3\]

    Correct Answer: D

    Solution :

    \[\underset{black}{\mathop{Mn{{O}_{2}}}}\,+4HCl\xrightarrow{{}}MnC{{l}_{2}}+\underset{greenish\,\,yellow\,\,gas}{\mathop{2{{H}_{2}}O+C{{l}_{2}}}}\,\] \[\overset{-3}{\mathop{N{{H}_{3}}}}\,+3C{{l}_{2}}\xrightarrow{{}}\overset{+3}{\mathop{NC{{l}_{3}}}}\,+3HCl\]


You need to login to perform this action.
You will be redirected in 3 sec spinner