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12th Class Chemistry The Solid State / ठोस प्रावस्था Question Bank MCQs - The Solid State

  • question_answer
    Formula of nickel oxide with metal deficiency defect in its crystal is \[N{{i}_{0.98}}O\]. The crystal contains \[N{{i}^{2+}}\] and \[N{{i}^{3+}}\] ions. The fraction of nickel existing as \[N{{i}^{2+}}\] ions in the crystal is

    A) 0.94

    B) 0.04

    C) 0.50

    D) 0.3

    Correct Answer: A

    Solution :

    Let the fraction of metal which exists as \[N{{i}^{2+}}\] ion be x. Then the fraction of metal as\[N{{i}^{3+}}=0.98-x\] \[\therefore 2x+3(0.98-x)=2\] \[\Rightarrow 2x+2.94-3x=2\Rightarrow x=0.94\]


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