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WB JEE Medical WB JEE Medical Solved Paper-2012

  • question_answer
    When \[{{H}_{2}}{{O}_{2}}\]is shaken with an acidified solution of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]in the presence of ether, the ethereal layer turns blue due to the formation of

    A)  \[C{{r}_{2}}{{O}_{3}}\]

    B)  \[CrO_{4}^{2-}\]

    C)  \[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]

    D)  \[Cr{{O}_{5}}\]

    Correct Answer: D

    Solution :

     \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}+4{{H}_{2}}{{O}_{2}}\to \] \[{{K}_{2}}S{{O}_{4}}+5{{H}_{2}}O+\underset{\text{dark}\,\text{blue}}{\mathop{2Cr{{O}_{5}}}}\,\]


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