Question

in laboratory preparation of hydrogen colour of ferric chloride changes when it comes in contact with zinc and dilute hydrochloric acid. Give reason​

Answer 1

Answer:

Explanation:

Ferric chloride on hydrolysis produces acidic solution.

FeCl  

3

​  

+3H  

2

​  

O→F(OH)  

3

​  

+3HCl

Zinc reacts with water produces nascent hydrogen.

Zn+H  

2

​  

O→ZnO+H  

2

​  

 

This nascent hydrogen reduces Fe  

3+

 to Fe  

2+

.

Hence, the colour changes to very light green.