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  4. The amount of chlorine evolved by passing 2 A of current in an aqueous solution of NaCl for 30 minutes is

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Q. The amount of chlorine evolved by passing $2 \,A$ of current in an aqueous solution of $NaCl$ for $30$ minutes is

AIIMSAIIMS 1999Electrochemistry

Solution:

$NaCl \to Na^{+}+Cl^{-}$
$2Cl^{-}+2e^{-} \to Cl_{2}$
$Q=I\times t=2\times30\times60$
$=3600$ Coulombs
$2\times 96500$ Coulombs produce $=71\,g$ of $Cl_{2}$
$3600$ Coulombs will produce $=\frac{71}{2\times96500}\times 3600$
$=1.32\,g$ of $Cl_{2}$