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 of these

Answer 1

The correct option is A complex salt

Double Salts: contain more than one anion or cation. They form when more than one salt is dissolved in a liquid and when together they crystallize in a regular pattern. Alum is an example of a double salt. Alum contains aluminum and sulphate ions.

Complex Salts: A class of salts in which there are no detectable quantities of each of the metal ions existing in solution; an example is $K_{3}Fe(CN{)}_6$, which in solution has $K^{+}$ but no $F{e}^{3+}$ because $Fe$ is strongly bound in the complex ion.