Tag: extraction of metals by electrolysis
Questions Related to extraction of metals by electrolysis
During the mid ninteenth century, Daguerro-type portraits were very popular. A portrait image of a person was made on silver plated copper by developing the image with ?
Silver can be spread as a thin sheet on another metal by electroplating. The film of silver sticks strongly to the metal. Which of the following metals cannot be properly plated with silver?
In electroplating of copper by silver, the silver acts as an :
Electrolysis of brine produces Na at cathode.
In the silver plating of copper, $K[Ag(CN) _2]$ is used instead of $AgNO _3$. The reason is:
In $Ag$ - $CuSO _{4}$ cell, silver electrode will serve as:
Electrolysis of a solution of $Mn{ SO } _{ 4 }$ in aqueous sulphuric acid is a method for the preparation of $MnO _ 2$. Passing a current of $27A$ for $24$ hours gives $1kg$ of $MnO _2$. The current efficiency in this process is:
Consider the reaction : $Cr _2O _7^{2-} + 14H^+ + 6e^- \to 2Cr^{3+}+7H _2O$
What is the quantity of electricity in coulombs needed to reduced $1\ mol$ of $Cr _2O _7^{2-}$?
Calculate the amounts of Na and chlorine gas produced during the electrolysis of fused $NaCl$ by the passage of 1 ampere current for 25 minutes.
A current of $13.4\mathrm { A }$ is passed through $1.0\mathrm { L }$ of $1.0\mathrm { M }$ $HCl$ solution by using $Pt$ electrodes for $1.0\ \mathrm { hr }.$ The $pH$ of the solution after the experiment is over at $298 K$ will be about.