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The time required to coat aluminium metal on the surface of a square plate of length 20 c m about 5 m m thickness on both sides by using molten A l C l 3 solution and 10 A current is nearly [Specific gravity of Al = 1.8 g mL − 1 ]

Options

  1. A107.2 hr
  2. B214.4 hr
  3. C53.6 hr
  4. D71.5 hr

Correct answer

B. 214.4 hr

Step-by-step solution

m = 20 × 20 × 0.5 × 2 × 1.8 = 720 g m ; m = 9 96500 × 10 × t t = 214.44 h r

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