Question

What happens when HSO is sent in potassium dichromate solution degraded by HSO4

Mention the appropriate chemical equations.​

Answer 1

Answer:

Step (i)    K  

2

​  

Cr  

2

​  

O  

7

​  

+H  

2

​  

SO  

4

​  

→K  

2

​  

SO  

4

​  

+H  

2

​  

Cr  

2

​  

O  

7

​  

 

Step (ii )   [H  

2

​  

O  

2

​  

→H  

2

​  

O+(O)]4

Step (iii)   H  

2

​  

Cr  

2

​  

O  

7

​  

+4(O)→2CrO  

5

​  

+H  

2

​  

O

Hence, K  

2

​  

Cr  

2

​  

O  

7

​  

+H  

2

​  

SO  

4

​  

+4H  

2

​  

O  

2

​  

→2CrO  

5

​  

+K  

2

​  

SO  

4

​  

+5H  

2

​  

O

The formation of Chromium Pentaoxide leads to the formation of blue colour from orange (as potassium dichromate is orange in colour). Chromium Pentaoxide is blue, so we get a blue colour after the reaction.