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Q.

A current of 1.25 amperes was passed for sixty minutes through a solution of a metal Chloride (At. mass of metal = 119) and 2.8 gms of metal was deposited. Correct statements are

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a

moles of electrons used are 0.047

b

E.C.E. of the metal is 6.22×104

c

equivalent weight of the metal is 120

d

oxidation state of the metal is 2

answer is B, C, D.

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Detailed Solution

(1)  Coulombs passed =1.25×60×60=4500

 Weight of metal deposited per Faraday =2.8×96,5004500=60 gms 

Equivalent weight of metal = 60

 Oxidation state of metal =119602

 Moles of e¯ used =450096,500=0.047

(4)  E.C.E. of metal =6096,500=6.22×104 gms per coulomb. 

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