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NEET Sample Paper NEET Sample Test Paper-86

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

    A) 392                  

    B)        31.6

    C) 278                  

    D)        156

    Correct Answer: A

    Solution :

    [a] Mohr's salt is \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O.\] \[F{{e}^{2+}}\] present in it is oxidized to \[F{{e}^{3+}}.\] So, we have, \[F{{e}^{2+}}\xrightarrow{{}}F{{e}^{3+}}+e\] Thus, equivalent mass \[\text{=}\frac{\text{Formula}\,\,\text{mass}}{\text{1}}\]                                              \[=392\]


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