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AMU Medical AMU Solved Paper-1999

  • question_answer
    The same quantity of electricity was passed through salt solutions of silver (at. wt. = 107.9) and gold (at. wt. = 197). If 1.439 g of Ag and 0.876 g of Au were deposited, the oxidation state of Au in the salt is

    A)  zero              

    B)  +2

    C)  +3             

    D)  +1

    Correct Answer: C

    Solution :

    : \[\frac{1.439}{0.876}=\frac{Eq.\text{ }wt.\text{ }of\text{ }silver}{Eq.\text{ }wt.\text{ }of\text{ }gold}\] \[\frac{1.439}{0.876}=\frac{108}{Eq.\text{ }wt.\text{ }of\text{ Au}}\] Eq. wt. of \[Au=64.5\]. Atomic weight of\[Au=196\] \[\therefore \]Oxidation state of Au in the salt \[=\frac{196}{64.5}=+3\]


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