Question

What gas is released when Manganese dioxide reacts with conc. HCl?
Is it chlorine??

Answer 1

Manganese dioxide is basic in nature , while HCL is definitely an acid.

So when they react,

MnO2 +2 HCL ⇒ MnCl2 + H2O

It is a neutralisation reaction, so salt and water are obtained as products.

Therefore , no gas is obtained.

Answer 2

$\bold{HYDRICHLORIC \: ACID}$

Hydrochloric acid (HCl) also known as muratic acid .The presence of hydrogen ion provides it its acidic properties in aqueous solution. .It is a monobasic acid means it has only one replaceable hydrogen ion and is highly volatile.

◼Hydrochloric acid gives out chlorine when reacts with oxidising agents. And is the way for manufacturing chlorine.

◼Manganese dioxide is a, powerful oxidising agent.

So,

When manganese dioxide is added to HCl it gives out greenish yellow gas which is chlorine with water and a salt.

$\bold{EXPERIMENT }$

Take a test tube and add manganese dioxide and HCl and mix it .

$\bold{OBSERVATION }$

◼A greenish yellow gas evolves which turns starch iodide paper blue black.

◼A brownish filtrate is left behind.

$\bold{EQUATION }$

$MnO_2 + 4HCl \longrightarrow MnCl_2 + 2H_2O + Cl_2$


Hence the gas evolved is chlorine.