1.

The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol–1) is : (1) 4 (2) 1 (3) 2 (4) 3 

Answer»

(2) 1

Ca+2 + 2e ® Ca(s) 

v.f. = 2 

As per faraday's 1st law Charge passed in faraday = g.eq of product 

= ´20/40 x 2 

= 1F 

w=ZQ.   => Q=w/Z

                     = 20/40/2 F

                     = 1Fw=ZQ.   => Q=w/Z

                     = 20/40/2 F

                     = 1FAs per faraday's 1st law Charge passed in faraday = g.eq of productw=ZQ.   => Q=w/Z

                     = 20/40/2 F

                     = 1F

As per faraday's 1st law Charge passed in faraday = g.eq of product


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