CGPET 2017 Solved Paper

∵2F amount of charge give =1mol of Zn2+ ions.
or, 2×96500C amount of charge give =1 mole of Zn2+ ions.
∴2×10−5C charge will give =

2×10−5

2×96500

(mole of Zn2+ ions)
Amount of Zn2+(n) ions =1.0×10−5
Also n=

w

M

where
n= number of moles
w= mass of Zn2+ ions
M= molar mass of Zn2+(65.5)
∴ w=n×M=1.00×10−5×65.5 (M molar Zn2+=65.5)
=65.5×10−5g
65.5×10−5×103 milligram.
=0.65≈0.64 milligram of Zn2+ ions.