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A layer of 0.25 mm thick chromium metal is to be electroplated on the rims of autovehicle with a total area of 32 m 2 from a solution of C r O 4 2 - . What amount of electric current is required for electroplating the rims in 60 sec? The density of chromium metal is 7.2 g/cc.

Options

  1. A4.9 × 1 0 3 A
  2. B1.78 × 1 0 3 A
  3. C5.3 × 1 0 4 A
  4. D10.69 × 1 0 6 A

Correct answer

D. 10.69 × 1 0 6 A

Step-by-step solution

Volume of coated lay = Area × thickness = 32 × 1 0 4 × 0.025 = 8000 c m 3 Mass of chromium deposited = volume × density = 8000 × 7.2 = 57600 g W = I t E 96500 57600 = I × 60 × ( 52 / 6 ) 96500 I = 10.69 × 1 0 6 amp.

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