Joke Collection Website - Cold jokes - Asking for chemical jokes

Asking for chemical jokes

① and ② can be transformed into each other, ② can be generated in boiling water, ③ can be oxidized into ④ in the air, and ④ has the smell of rotten eggs. What are these 123④? The answer goes down.

Answer: ① chicken, ② raw eggs, ③ cooked eggs, ④ rotten eggs.