Current Electricity - Result Question 59

63. If nearly $10^{5}$ coulombs liberate 1 gm-equivalent of aluminium, then the amount of aluminium (equivalent weight 9), deposited through electrolysis in 20 minutes by a current of $50 amp$. will be

[1998]

(a) $0.6 gm$

(b) $0.09 gm$

(c) $5.4 gm$

(d) $10.8 gm$

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Answer:

Correct Answer: 63. (c)

Solution:

  1. (c) $m=Z i t, 9=Z \times 10^{5}, Z=9 \times 10^{-5}$

Again,

$m=Z i t=9 \times 10^{-5} \times 50 \times 20 \times 60=5.4 gm$