Question

Some salts although containing two different metallic elements give test for one of them in solution. Such salts are :

• A. Complex salt
• B. Double salt
• C. Normal salt
• D. None

Answer 1

Answer: (A)

Complex salt

Answer 2

Fe(CN)2 + 4KCN $\longrightarrow$ Fe(CN)2.4 KCN $\rightleftharpoons$ 4K+ + [Fe(CN)6]4–

It gives test of K+ but does not give test of Fe2+. These type of salts which do not lose their identity when dissolved in water are called complexes