During electrolysis of an aqueous solution of \( \mathrm{CuSO}_{4} \) using copper electrodes, i...

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During electrolysis of an aqueous solution of \( \mathrm{CuSO}_{4} \) using copper electrodes, if \( 2.5 \mathrm{~g} \) of \( \mathrm{Cu} \) is deposited at cathode, then at anode
\( P \)
(A) \( 890 \mathrm{ml} \) of \( \mathrm{Cl}_{2} \) at \( \mathrm{STP} \) is liberated
(B) \( 445 \mathrm{ml} \) of \( \mathrm{O}_{2} \) at \( \mathrm{STP} \) is liberated
(C) \( 2.5 \mathrm{~g} \) of copper is deposited
(D) a decrease of \( 2.5 \mathrm{~g} \) of mass takes place
W.
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