2. Solved Papers
  3. VMMC

VMMC VMMC Medical Solved Paper-2007

  • question_answer
    The oxidation number of sulphur in \[\text{N}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{3}}}\] is

    A) +1                          

    B)        +2                          

    C) +3                          

    D)        -3

    Correct Answer: B

    Solution :

    Key Idea: The sum of oxidation state of all atoms in a molecule is zero. Suppose oxidation state of S in \[\text{N}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{3}}}\]is \[x,\] \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\]                 \[\therefore \]  \[(2x+1)+2x+(-2\times 3)=0\]                 or            \[2+2x-6=0\] or            \[2x=+\,4\] \[\therefore \]  \[x=+\,2\]


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