2. Questions Bank
  3. NEET
  4. Chemistry
  5. The d-and f-Block Elements / d तथा f ब्लॉक के तत्व

NEET Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Self Evaluation Test - The d-and f-Block Elements

  • question_answer
    In the preparation of \[KMn{{O}_{4}}\] pyrolusite \[(Mn{{O}_{2}})\] is first converted to potassium manganite\[({{K}_{2}}Mn{{O}_{4}})\]. In this conversion, the oxidation state of manganese changes from

    A) +1 to +3        

    B) +2 to +4

    C) +3 to +5        

    D) +4 to +6

    Correct Answer: D

    Solution :

    [d] In \[Mn{{O}_{2}}\left( O.S.of\,Mn\,is+4 \right)in\,{{K}_{2}}Mn{{O}_{4}}\] (O.S. of Mn is +6). Hence O.S. changes by 2.


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