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Q.

Cost of Electricity to liberate 24 grams of Oxygen is Rs 3000. Cost of Electricity to deposit 24 grams of Magnesium will be

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a

Rs 4300

b

Rs 2000

c

Rs 2500

d

Rs 1500

answer is A.

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Detailed Solution

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8 gram of Oxygen = GEW 
Which requires one Faraday; 
Thus cost of 3F = Rs 3000; 
GEW of ‘Mg’ = 12g; 
12 g require Rs 1000 
24 g require Rs X 
X = Rs 2000

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