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Question

The cost of electricity required to deposit 1 g of magnesium is Rs. 5.00. How much would it cost to deposit 10 g of aluminium?


A
Rs. 10.00
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B
Rs. 27.00
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C
Rs. 44.44
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D
Rs. 66.67
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Solution

The correct option is B Rs. 66.67
Mg2++2eMg
1g of Mg=124 mole of Mg
Amount of electricity=124×2 electricity

124 mole ecosts Rs5
1 mole ecosts=Rs5×12=60

10g Al=1027 mole ofAg

Al3++3eAg
mole of eused=10×327=309mole

cost of electricity=10×609=6009=Rs 66.67.

Hence, option D is correct.

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