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DUMET Medical DUMET Medical Solved Paper-2002

  • question_answer
    If \[HN{{O}_{3}}\] changes into \[{{N}_{2}}O\], the change in oxidation number is:

    A)  zero            

    B)  +4

    C)  +2             

    D)  + 6

    Correct Answer: B

    Solution :

    Key Idea: The sum of oxidation state of all elements in compound is zero. Let oxidation state of \[N=x\] \[HN{{O}_{3}}\] \[{{N}_{2}}O\] \[+1+x+(-2\times 3)=0\] \[2x+(-2)=0\] \[\therefore x=+5\] \[\therefore x=+1\] \[\therefore \] Change in oxidation state = (+5) - (+1) = + 4


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