Question

Some salts containing two different metallic elements give test for only one of them in solution, such salts are

• A. Double salts
• B. Normal salts
• C. Complex salts
• D. None of these

Answer 1

Answer: (C)

Complex salts

Some salts containing two different metallic elements give test for only one of them in solution, such salts are complex salts. For example, $K_4\left[Fe{\left(CN\right)}_6\right]$ is a complex salt. In aqueous solution, it will dissociate into $K^{+}$ ions and ${\left[Fe{\left(CN\right)}_6\right]}^{4-}$ ions. The aqueous solution of $K_4\left[Fe{\left(CN\right)}_6\right]$ will give test for $K^{+}$ ions only. It will not give test for $F{e}^{2+}$ ions.