Write chemical reactions to show the amphoteric nature of water.

Explanation :

Amphoteric oxide : Those oxide which reacts with acid as well as base are known as Amphoteric oxide.

Reaction of water with Acid: 

H₂O(l )+H₂S(g)⇌ H₂ O⁺(aq) + HS^-(aq)

Reaction of water with base:

H₂ O(l ) + NH₃  ⇌ OH^-+NH₄⁺

Final Answer : Hence the correct answer is 

H_2 O(l )+H_2 S(g)⇌ H_2 O^+(aq) + HS^-(aq)

H_2 O(l ) + NH_3  ⇌ OH^-+NH_4^+

These are the reactions to show the amphoteric nature of water.