(B) Total mass of $Al$ required = $24 \times 5.0 \ g = 120 \ g$. Using Faraday's law: $w = \frac{M}{n \times F} \times I \times t \times \text{efficie

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(B) Total mass of $Al$ required = $24 \times 5.0 \ g = 120 \ g$. Using Faraday's law: $w = \frac{M}{n \times F} \times I \times t \times \text{efficiency}$. Here,$w = 120 \ g$,$M = 27 \ g/mol$,$n = 3$ (for $Al^{3+} + 3e^- \rightarrow Al$),$F = 96500 \ C/mol$,$I = 9650 \ A$,and efficiency = $0.90$. $120 = \frac{27}{3 \times 96500} \times 9650 \times t \times 0.90$. $120 = \frac{27}{30} \times t \times 0.90$. $120 = 0.9 \times 0.9 \times t$. $120 = 0.81 \times t$. $t = \frac{120}{0.81} \approx 148.14 \ s$.

Class 12 Chemistry Electrochemistry Faraday’s law of electrolysis

Medium

In the Hall process,aluminium is produced by the electrolysis of molten $Al_2O_3$. How many seconds would it take to produce enough aluminium by the Hall process to make a case of $24$ cans of aluminium soft-drink,if each can uses $5.0 \ g$ of $Al$,a current of $9650 \ A$ is employed,and the current efficiency of the cell is $90.0 \ \%$?

A
$203.2$
B
$148.14$
C
$333.33$
D
$6.17$

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Class 12 Questions

Class 12

Chemistry Questions

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Electrochemistry

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Faraday’s law of electrolysis

State Faraday's laws of electrolysis and mention their uses.

Medium

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An electric current is passed through a silver voltameter connected to a water voltameter. The cathode of the silver voltameter weighed $0.108 \ g$ more at the end of the electrolysis. The volume of oxygen evolved at $STP$ is ............... $cm^{3}$.

Medium

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For the electrolytic decomposition of $18 \ g$ of $H_2O$,how many hours of current at $3 \ A$ must be passed?

Easy

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In the electrolysis of a $CuSO_4$ solution,how many grams of $Cu$ are plated out on the cathode,in the time that is required to liberate $5.6 \ L$ of $O_{2(g)}$,measured at $1 \ atm$ and $273 \ K$,at the anode (in $g$)?

MediumAP EAMCET 2021

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For electroplating,$1.5 \ A$ current is passed for $250 \ s$ through $250 \ mL$ of $0.15 \ M$ solution of $MSO_4$. Only $85 \ \%$ of the current was utilised for electrolysis. The molarity of $MSO_4$ solution after electrolysis is closest to $.......$ [Assume that the volume of the solution remained constant] (in $M$)

MediumKVPY 2016

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State Faraday's laws of electrolysis and mention their uses.

An electric current is passed through a silver voltameter connected to a water voltameter. The cathode of the silver voltameter weighed $0.108 \ g$ more at the end of the electrolysis. The volume of oxygen evolved at $STP$ is ............... $cm^{3}$.

For the electrolytic decomposition of $18 \ g$ of $H_2O$,how many hours of current at $3 \ A$ must be passed?

In the electrolysis of a $CuSO_4$ solution,how many grams of $Cu$ are plated out on the cathode,in the time that is required to liberate $5.6 \ L$ of $O_{2(g)}$,measured at $1 \ atm$ and $273 \ K$,at the anode (in $g$)?

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