SELECT * FROM question_mgmt as q WHERE id=1806 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=58 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

How much electricity in terms of Faraday is required to produce

(i) 20.0 g of Ca from molten CaCl2.

(ii) 40.0 g of Al from molten Al2O3.

Answer:

(i) According to the question,

Electricity required to produce 40 g of calcium = 2 F

Therefore, electricity required to produce 20 g of calcium = (2x20) / 40 

= 1 F

 

(ii) According to the question,

Electricity required to produce 27 g of Al = 3 F

 

Therefore, electricity required to produce 40 g of Al = (3X40) / 27

= 4.44 F


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