ElectrochemistryHard
Question
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 10 gm Hg. (atomic mass of Na = 23).
Options
A.7.77 min
B.9.44 min.
C.5.24 min.
D.11.39 min.
Solution
90 gm Hg has 10 gm Na
∴ 10 gm Hg =
× 10 = 
gm Na
∴ weight of Na =
[∴ Na+ + e → Na]
∴t =
= 7.77 min
∴ 10 gm Hg =
× 10 = gm Na∴ weight of Na =
[∴ Na+ + e → Na]∴t =
= 7.77 minCreate a free account to view solution
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