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  4. 1M aqueous solution of AgNO3 , Cu((NO)3)2 and Au((NO)3)3 are electrolyzed, the same amount of electricity passes through each solution. If 0.1mol of solid Cu is formed then how many moles of Ag and Au are formed?

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Q. $1M$ aqueous solution of $AgNO_{3}$ , $Cu\left(\left(NO\right)_{3}\right)_{2}$ and $Au\left(\left(NO\right)_{3}\right)_{3}$ are electrolyzed, the same amount of electricity passes through each solution. If $0.1mol$ of solid $Cu$ is formed then how many moles of $Ag$ and $Au$ are formed?

NTA AbhyasNTA Abhyas 2020

Solution:

Here, $eq.$ of $Ag=eq.$ of $Cu=eq.$ of $Au$
$\Rightarrow 1\times n_{Ag}=2\times 0.1mol=3\times n_{Au}$
$\therefore n_{Ag}=0.2mol$ and $n_{Au}=0.067mol$