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(D) According to Faraday's second law of electrolysis,the mass of different substances deposited by the same quantity of electricity is proportional t

Vedclass · Accepted Answer

$3.2$

Vedclass · Answer

(D) According to Faraday's second law of electrolysis,the mass of different substances deposited by the same quantity of electricity is proportional to their equivalent weights.Number of equivalents of $Ag$ $=$ Number of equivalents of $Cu$.Equivalent weight of $Ag = \frac{	ext{Atomic mass of } Ag}{	ext{Valency of } Ag} = \frac{108}{1} = 108$.Equivalent weight of $Cu = \frac{	ext{Atomic mass of } Cu}{	ext{Valency of } Cu} = \frac{63.5}{2} = 31.75$.Using the formula: $\frac{	ext{Mass of } Ag}{	ext{Equivalent weight of } Ag} = \frac{	ext{Mass of } Cu}{	ext{Equivalent weight of } Cu}$.$\frac{10.79}{108} = \frac{	ext{Mass of } Cu}{31.75}$.$	ext{Mass of } Cu = \frac{10.79 	imes 31.75}{108} \approx 3.17 \ g \approx 3.2 \ g$.

Column $I$ (Reduction process)	Column $II$ (Charge required)
$(a)$ $1$ mol of $MnO_4^-$ to $Mn^{2+}$	$(p)$ $193000$ $C$
$(b)$ $1$ mole of $Cr_2O_7^{2-}$ to $Cr^{3+}$	$(q)$ $289500$ $C$
$(c)$ $1$ mole of $Sn^{4+}$ to $Sn^{2+}$	$(r)$ $482500$ $C$
$(d)$ $1$ mole of $Al^{3+}$ to $Al$	$(s)$ $579000$ $C$

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