`Na-` amalgam is prepared by electrolysis of `NaCl` solution using liquid `Hg` as cathode . How long should the current of `10 amp`. Is passed to produce `10% Na-Hg` on a cathode of `10gm Hg`. ( atomic mass of `Na=23)`.

Options

A. `7.77 `min
B. `9.44` min.
C. `5.24 mi n.`
D. `11.39 mi n`.

Answer

1

Explanation

90 gm Hg has 10 gm Na
10 gm Hg `=(10)/(90)xx10=(10)/(9)gm" "Na`
weight of Na`=(M)/(n)xx(ixxt)/(96500)`
`(10)/(9)=(23)/(1)xx(10xxt)/(96500)" "[:.Na^(+)+erarrNa]`
`t=(10xx96500)/(9xx10xx23)=7.77mi n`