Question

Which one of the following statement is correct?

(a) Maganese salts give a violet borax bead test in the reducing flame 

(b) From a mixed precipitate of AgCl and Agl, ammonia solution dissolves only AgCl 

(c) Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution 

(d) On boiling a solution having K⁺, Ca²⁺ and HCO₃^- ions we get a precipitate of K₂Ca (CO₃)₂

Answer 1

Correct option is (b) From a mixed precipitate of AgCl and Agl, ammonia solution dissolves only AgCl 

Ammonia can dissolve ppt. of AgCl only due to formation of complex as given below:

AgCl + 2NH₃​ → [Ag(NH₃​)₂​]Cl