Home
Class 12
CHEMISTRY
Zn amalgam is prepared by elctrtolysis o...

Zn amalgam is prepared by elctrtolysis of aqueous `ZnCI_(2)` using 9 gram Hg cathode how much current is to be pased through `ZnCI_(2)` solution for 1000 seconds to prepare a Zn amalagam with 25% by weight ? (atomic masss Zn =65.4 g)

A

Current off `8.85` amp is passed in the process.

B

Current of `5.65` amp is passed in the process

C

Mass of `Zn` in Amalgam is `3gm`

D

Mass of `Zn` in Amalgam is `6gm`.

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
Let `x` gm of `Zn` deposit of `9gm` of `Hg`
`%` of `Zn` in Amalgam`=(m_(Zn)xx100)/(m_(Zn)xxm_(Hg))=x/(9+x)xx100=25`
`:.x=3gm`
Eq. of `Zn=(3xx2)/(65.4)`
`(n_(Zn))/1=(n_(e^(-)))/2=Q/(2f)=("it")/(2f)`
Current `i=6/(65.4)xx96500/1000=8.85amp.`
Promotional Banner

Similar Questions

Explore conceptually related problems

Cadmium amalgam is prepared by electrolysis of a sodium of CdCl_2 using a mercury cathode. How long should a current of 4 A be passed in order to prepare 10% by mass Cd in Cd-Hg amalgam on cathode of 4.5 g Hg? (atomic mass of Cd=112)

Cd amalgam is preapred by electrolysis of a solution CdCI_(2) using a mercury cathode. How long should a current of 5A be passed in order to prepare 12% Cd-Hg amalgam on a cathode of 2g, Hg ( atomic weight of Cd = 112.4)

Na-Amalgam is prepared by electrolysis of aq. NaCI solution using 10gm Hg cathode. How many Faraday's of electricity is required to prepare 18.7% Na-Amalgam (current Eff = 50%)

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) .

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 ). (A). 7.77 min (B). 9.44 min. (C). 5.24 min. (D). 11.39 min

In the electrolysis of 7.2L aqueous solution of CuSO_(4) , a current of 9.65A passed for 2 hours. Find the weight of Cu deposited at cathode.

The number of moles of Zn^(2+) ions deposited when a current of 1.5A is passed for 4 hours through a molten solution of a zinc salt. ( Assume current efficiency to be 90%)

How many minutes will it take to plate out 5.2g of Cr from a Cr_2(SO_4)_3 solution using a current of 9.65 A ? (Atomic mass:Cr=52.0)

Concentrated aqueous sulphuric acid is 98% H_(2)SO_(4) by mass. How many grams of concentrated sulphuric acid solution should be used to prepare 250 ml of 2.0 M H_(2)SO_(4) ?

Two ampere current is passed through a solution of Zn^(+2) for 6 hours using steel cathode. Calculate the weight of zinc that can be plated on the cathode. If the cathode has a surface of 1//m^(2) and the radius of zinc atom is 0.625Å. What is the thickness of coating layer?