What is a disproportionation reaction, and which of the

Solution 84P

Here we have to find out among the given chemical equation which one is a disproportionation reaction.

Disproportionation reaction is one in which a substance act as both reducing and oxidising agent i.e an atom react with another atom and form higher and lower oxidation state.

Step 1

(a)I2 (s) + KI (aq) → KI3 (aq)

The oxidation state of each atom in the given reaction has assigned ,

 I in I2 reduces to I in KI3. I in KI oxidizes to I in KI3. This reaction is not a disproportionation reaction since different substances have atoms that reduce or oxidize. The reverse direction would be a disproportionation reaction because a single substance i.e I in KI both oxidizes and reduces.

Thus the given reaction is not a disproportionation reaction.