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Standard XII

Chemistry

Assigning Oxidation Numbers

How many minu...

Question

How many minutes will it takes to plate out 5.2 g of Cr from a $C r_{2} (S O_{4})_{3}$ solution using a current of 9.65 A? (Atomic weight of Cr = 52.0)

200

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100

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103

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Solution

The correct option is B 50
By Faraday's Law, $w = Z i t$

or, $w = \frac{E}{96500} \times i \times t$ where, $E =$ equivalent weight

Here, $E = \frac{52}{3}$

$∴ 5.2 = \frac{52}{96500 \times 3} \times 9.65 \times t$

$∴ t = 3000$ $s e c o n d s$

$∴ t = 50$ $m i n u t e s$

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Q. Chromium metal can be plated out from an acidic solution containing

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How many minutes will it takes to plate out 5.2 g of Cr from a Cr2(SO4)3 solution using a current of 9.65 A? (Atomic weight of Cr = 52.0)

The correct option is B 50By Faraday's Law, w=Zit or, w=E96500×i×t where, E= equivalent weight Here, E=523 ∴5.2=5296500×3×9.65×t ∴t=3000 seconds ∴t=50 minutes

How many minutes will it takes to plate out 5.2 g of Cr from a $C r_{2} (S O_{4})_{3}$ solution using a current of 9.65 A? (Atomic weight of Cr = 52.0)

The correct option is B 50
By Faraday's Law, $w = Z i t$

or, $w = \frac{E}{96500} \times i \times t$ where, $E =$ equivalent weight

Here, $E = \frac{52}{3}$

$∴ 5.2 = \frac{52}{96500 \times 3} \times 9.65 \times t$

$∴ t = 3000$ $s e c o n d s$

$∴ t = 50$ $m i n u t e s$