Question

Identify the gas evolved in the following reactions when:
Concentrated hydrochloric acid is made to react with manganese dioxide.

Answer 1

The gas that evolved is Chlorine, $C{l}_2$.

When concentrated Hydrochloric acid is made to react with Manganese Dioxide, we obtain Chlorine gas which is greenish-yellow.

$Mn{O}_2\left(s\right)+4HCI\left(aq\right)\to MnC{I}_2\left(aq\right)+H_{2}O\left(I\right)+C{I}_2\left(g\right)$

ManganeseDioxide HydrochloricAcid Manganese(II)Chloride Water Chlorine

Chlorine gas, $C{l}_2$, is evolved.