A. 5.4 min
B. 10.8 min
C. 15.0 min
D. 20.0 min
Correct Answer:
Option A – 5.4 min
Explanation
From faradays law, M = itz
But mass, M = volume x density
and volume = cross sectional area x thickness
M = 118.8cm² x 10-6 x 9 x 10³
∴ 118.8cm² x 10-6 x 9 x 10³ = 10 x t x 3.3 x 10-7
∴ (118.8 x 9) x 10-7 = 10 x t x 3.3 x 10-7
∴ t = 118.8×93.3
t = 324 seconds
Convert to minutes by dividing by 60
t = 32460
t = 5.4 sec
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