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AIPMT PRELIMS2009Chemistry-Electrochemistry

AIPMT PRELIMS 2009 Chemistry Electrolysis MCQ Question

Type: MCQ-numerical-Hard-Class 12

Al₂O₃ is reduced by electrolysis at low potentials and high currents. If 4.0 × 10⁴ amperes of current is passed through molten Al₂O₃ for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency. At. mass of Al = 27 g mol⁻¹)

A

8.1 × 10⁴ g

B

2.4 × 10⁵ g

C

1.3 × 10⁴ g

D

9.0 × 10³ g

Correct Answer

Option A

Detailed Explanation

The total charge passed is calculated as current × time = 4.0 × 10⁴ A × 6 × 60 × 60 s. Using Faraday's laws, 96500 C liberates 9 g of Al. Therefore, the mass of Al produced is 8.1 × 10⁴ g.

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