1.

What would be the change in no. of electron, when silver and gold is obtained by eduction of its ion on adding Zinc respectively ?

Answer»

(2, 1)
(1, 3) 
(2, 2) 
(3, 1) 

SOLUTION :SILVER (AG):
`{:(2[Ag(CN)(2)^(-)]_((aq))+Zn_((s))rarr2A_((s))+[Zn(CN)_(4)]_((aq))^(2-)),(" "UARR""uarr),(2(+1)""("Reduction by")/("Change of e"^(-))""(0)2):}`
GOLD (Au) :
`{:(2(Au(CN)_(2))_((aq))^(-)+Zn_((s))rarr2Au_((s))+(Zn(CN)_(4))_((aq))^(-)),(" "uarr""uarr),(2(+1)""("Reduction by")/("Change of e"^(-))""(0)2):}`


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