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JEE Main & Advanced Sample Paper JEE Main Sample Paper-4

  • question_answer
    \[C{{r}_{2}}O_{7}^{2-}\xrightarrow[{}]{pH=x}Cr_{4}^{2-}\xrightarrow[{}]{pH=y}C{{r}_{2}}O_{7}^{2-}pH\]values x and y can be

    A)  4 and 5                                

    B)  4 and 8  

    C)  8 and 4                                

    D)  8 and 9

    Correct Answer: C

    Solution :

    \[C{{r}_{2}}O_{7}^{2-}+2O{{H}^{-}}\xrightarrow[{}]{{}}2CrO_{4}^{2-}+{{H}_{2}}O\]\[pH>7(x>7)\] \[2CrO_{4}^{2-}+2{{H}^{+}}\xrightarrow[{}]{{}}C{{r}_{2}}_{7}^{2-}+{{H}_{2}}O\]\[pH<7(y<7)\]


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