Question

Give laboratory preparation of hydrogen with a well labeled diagram and what precautions

should we take while preparatio​

Answer 1

Answer:

In the laboratory, dihydrogen gas is prepared by taking zinc granules in a 500 ml flask.

To this, dilute HCl or dilute sulphuric acid is added through a thistle funnel.

Dihydrogen gas is released and the gas is collected by the downward displacement of water because it is a gas lighter than water

Reaction:

Zn  

(s)

​  

+2HCl  

(aq)

​  

→ZnCl  

2(aq)

​  

+H  

2(g)

​  

 

Zn  

(s)

​  

+H  

2

​  

SO  

4(aq)

​  

→ZnSO  

4(aq)

​  

+H  

2(g)

​  

.