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JEE Main & Advanced Chemistry Redox Reactions / रेडॉक्स अभिक्रियाएँ Question Bank Critical Thinking

  • question_answer
    The compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity has copper in oxidation state ........ Assume that the rare earth element Yttrium is in its usual \[+\,3\] oxidation state [IIT 1994]

    A)                 3/7        

    B)                 7/3

    C)                 3             

    D)                 7

    Correct Answer: B

    Solution :

           \[B{{a}_{2}}\overset{*\,\,}{\mathop{C{{u}_{3}}}}\,{{O}_{7}}\]            \[3+2\times 2+3x-(2\times 7)=0\]            \[3+4+3x-14=0\]            \[3x=7\]                                 \[x=\frac{7}{3}\].


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