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  4. Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl ?

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Q. Which of the following is used to prepare $Cl_2$ gas at room temperature from concentrated $HCl$ ?

WBJEEWBJEE 2011The p-Block Elements - Part2

Solution:

Manganese dioxide $\left( MnO _{2}\right)$ is heated with concentrated $HCl$ to form $Cl _{2}$
$
MnO _{2}+4 HCl \rightarrow MnCl _{2}+ Cl _{2}+2 H _{2} O
$
$HCl$ in action with potassium permanganate gives $C _{2}$
$
2 KMnO _{4}+16 HCl \rightarrow 2 KCl +2 MnCl _{2}+8 H _{2} O +5 Cl _{2} .
$
Hence option A and C is correct.