- Home
- Standard 12
- Chemistry
General Principles and processes of Isolation of Elements
hard
During the electrolysis of carnallite, $MgCl_2$ is decomposed and not $KCl$. This is because of
A
lower decomposition voltage of $MgCl_2$ than that of $KCl$
B
reverse reaction $MgCl_2+2K\to Mg+2KCl$ if $KCl$ is decomposed under other experimental condition
C
both $(A)$ and $(B)$
D
none of the above
Solution
The decomposition voltage of $\mathrm{MgCl}_{2}$ is lower than that of $\mathrm{KCl}$.
Also, if KCl is decomposed during experimental conditions, it is regenerated by the reverse reaction.
$\mathrm{MgCl}_{2}+2 \mathrm{K} \rightarrow \mathrm{Mg}+2 \mathrm{KCl}$
Thus, during the electrolysis of carnallite, $\mathrm{MgCl}_{2}$ is decomposed and not $\mathrm{KCl}$.
Option C is correct.
Standard 12
Chemistry
