2. Solved Papers
  3. JAMIA MILLIA ISLAMIA

JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2008

  • question_answer
        The formula mass of Mohrs salt is 392. The. iron present in it is oxidised by\[KMn{{O}_{4}}\]in acid medium. The equivalent mass of Mohrs salt is

    A)  392                                       

    B)  31.6

    C)  278                                       

    D)  156

    Correct Answer: A

    Solution :

                    Mohrs salt is\[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.FeS{{O}_{4}}.6{{H}_{2}}O\]The equation is \[5F{{e}^{2+}}+MnO_{4}^{-}+8{{H}^{+}}\xrightarrow[{}]{{}}\]                                 \[2F{{e}^{3+}}+M{{n}^{2+}}+4{{H}_{2}}O\] Total change in oxidation number of iron \[=(+3)-(+2)\] \[=+1\] So, equivalent wt. of Mohrs salt \[=\frac{Mol.\text{ }wt.\text{ }of\text{ }Mohrs\text{ }salt}{1}\] \[=\frac{392}{1}\] \[=392\]


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