A) \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\]
B) \[NaAl{{O}_{2}}\]
C) \[N{{a}_{2}}S{{O}_{4}}.Al{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\]
D) \[KCl.MgC{{l}_{2}}.6{{H}_{2}}O.\]
Correct Answer: C
Solution :
The term alum is used for all the double sulphates having the composition, \[{{M}_{2}}S{{O}_{4}}.\]\[M_{2}^{}{{(S{{O}_{4}})}_{3}}.24\,{{H}_{2}}O,\] where M stands for monovalent basic radicals such \[N{{a}^{+}},{{K}^{+}}\]etc. and\[M\]for trivalent basic radicals such as \[A{{l}^{3+}},C{{r}^{3+}}\]etc.
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