On passing a current through KCl solution,19. | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The reactions at the cathode are:$K^+ + e^- \rightarrow K$$Al^{3+} + 3e^- \rightarrow Al$According to Faraday's laws of electrolysis,the mass depo

Vedclass · Accepted Answer

$4.5$

Vedclass · Answer

(A) The reactions at the cathode are:$K^+ + e^- ightarrow K$$Al^{3+} + 3e^- ightarrow Al$According to Faraday's laws of electrolysis,the mass deposited is proportional to the equivalent mass.Moles of $K$ deposited $= 19.5 \ g / 39 \ g/mol = 0.5 \ mol$.Since $1 \ mol$ of $K^+$ requires $1 \ mol$ of electrons,$0.5 \ mol$ of electrons are passed.For $Al^{3+}$,the reaction is $Al^{3+} + 3e^- ightarrow Al$.Thus,$3 \ mol$ of electrons deposit $1 \ mol$ of $Al$.So,$0.5 \ mol$ of electrons will deposit $0.5 / 3 = 1/6 \ mol$ of $Al$.Mass of $Al$ deposited $= (1/6) \ mol 	imes 27 \ g/mol = 4.5 \ g$.

On passing a current through $KCl$ solution,$19.5 \ g$ of potassium is deposited. If the same quantity of electricity is passed through a solution of aluminium chloride,the amount of aluminium deposited is ............ $g$

Similar Questions

Three faradays of electricity are passed through molten $Al_2O_3$,aqueous solution of $CuSO_4$ and molten $NaCl$ taken in different electrolytic cells. The amount of $Al$,$Cu$ and $Na$ deposited at the cathodes will be in the ratio of

The electrochemical equivalent of a metal is $x \ g \ C^{-1}$. The equivalent weight of the metal is:

When $3 \ F$ of electricity is passed through an aqueous solution of iron $(II)$ bromide,what is the mass of iron metal deposited at the cathode in $g$?

How much volume of oxygen at $STP$ will be liberated by $2$ $ampere$ flowing for $3$ $minutes$ and $13$ $seconds$ through acidified water? (in $cc$)

The amount of ion discharged during electrolysis is not directly proportional to

Vedclass Test Series

Exam Paper Generator

Online Exam Module