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A 4.0 molar aqueous solution of NaCl is ...

A 4.0 molar aqueous solution of NaCl is prepared and 500mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (Atomic mass: Na= 23: Hg=200, 1 faraday= 96500 coulomb)
If the cathode is a Hg electrode, the maximum weight (in g) of Na-Hg amalgam formed from this solution is

A

200

B

225

C

400

D

446

Text Solution

Verified by Experts

The correct Answer is:
D
Electrolysis gives 2 mol sodium at cathode. Thus, amalgam (Na/Hg) will contain 2 mol of each sodium and Hg. Mass of amalgam`=2 xx 200 +2 xx 23= 446`
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