JEE Main & Advanced Chemistry Hydrogen & Its Compounds Question Bank Hydrogen peroxide

  • question_answer On shaking \[{{H}_{2}}{{O}_{2}}\] with acidified potassium dichromate and ether, ethereal layer becomes

    A) Green

    B) Red

    C) Blue

    D) Black

    Correct Answer: C

    Solution :

    This is due to the formation of \[Cr{{O}_{5}}\]. \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}+4{{H}_{2}}{{O}_{2}}\to {{K}_{2}}S{{O}_{4}}+\underset{\text{Blue}}{\mathop{2Cr{{O}_{5}}}}\,+5{{H}_{2}}O\]

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