Question

A salt solution which forms an inky blue solution with excess of ammonium hydroxide

1 point

Ferrous sulphate

Copper sulphate

Ferric sulphate

Copper sulphide​

Answer 1

Explanation:

A clear solution of ammonium hydroxide is added to a pale blue solution of copper sulfate, producing a striking blue precipitate that remains suspended near the surface of the solution.

Answer 2

answer;When NH  

4  

OH solution is added drop by drop to copper sulphate solution a pale blue / bluish white precipitate is formed which is soluble in excess of NH  

4  

OH and deep blue / inky blue solution is formed.  

CuSO  

4  

+2NH  

4  

OH→Cu(OH)  

2  

+(NH  

4  

)  

2  

SO  

4

Cu(OH)  

2  

+4NH  

4  

OH→Cu(NH  

3   )  4 ​  

(OH)  

2 ​  

+4H  

2  

O

Therefore, option A is correct.