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Na- amalgam is prepared by electrolysis ...

`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)`.

A

7.77 min

B

9.44 min

C

5.24 min

D

11.39 min

Text Solution

Verified by Experts

The correct Answer is:
A
90 gm Hg has 10 gm Na
`therefore10gmHg=(10)/(90)xx10=(10)/(9)gmNa`
`therefore` weight of Na`=(M)/(n)xx(ixxt)/(96500)`
`(10)/(9)=(23)/(1)xx(10xxt)/(9xx10xx23)` `[therforeNa^(+)+etoNa]`
`thereforet=(10xx96500)/(9xx10xx23)=7.77min`
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