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Question

The mass of carbon anode consumed (giving of carbon dioxide) in the production of 270 kg aluminium metal bum bauxite by Hall process is: (Atomic mass Al=27)

A
180 kg
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B
270 kg
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C
540 kg
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D
90 kg
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Solution

The correct option is D 90 kg
The chemical reaction for the Hall process is given by
2Al2O3+3C4Al+3CO2
Moles of aluminium produced=27000027=10000
According to the reaction,
10000kg moles of aluminium can be produced by consuming 2500×3=7500 moles of Carbon
Hence mass of carbon=12×7500=90000 g=90 kg

Therefore, D is the correct answer

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