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

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