SATHEE: Redox Reactions And Electrochemistry Ques 737

Redox Reactions And Electrochemistry Ques 737

Question: Zn-Hg is prepared by electrolysis of aqueous $Z n C l_{2}$ using Hg cathode (9g). How much current is to be passed through $Z n C l_{2}$ solution for 1000 s to prepare a Zn-Hg with 25% Zn by weight (Zn = 65.4):

Options:

A) 5.6 A

B) 7.2 A

C) 8.85 A

D) 11.2 A

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Let x gram of Zn deposited on 9 g of Hg % of Zn in amalgam $= \frac{x}{9 + x} \times 100 = 25$

$∴$ $x = 3 g$ Eq. of $Z n = \frac{3 \times 2}{65.4}$ $C u r r e n t, = \frac{6}{65.4} \times \frac{96500}{100} = 8.85 A$

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Redox Reactions And Electrochemistry Ques 737

Question: Zn-Hg is prepared by electrolysis of aqueous ZnCl2 using Hg cathode (9g). How much current is to be passed through ZnCl2 solution for 1000 s to prepare a Zn-Hg with 25% Zn by weight (Zn = 65.4):

Options:

Answer:

Solution:

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Question: Zn-Hg is prepared by electrolysis of aqueous $Z n C l_{2}$ using Hg cathode (9g). How much current is to be passed through $Z n C l_{2}$ solution for 1000 s to prepare a Zn-Hg with 25% Zn by weight (Zn = 65.4):