A) Potash alum
B) Hypo
C) \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
D) Bleaching powder
Correct Answer: A
Solution :
\[{{K}_{2}}S{{O}_{4}}\]dissolves in water with\[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]and forms double salt which is called potash alum (Fitkan) \[{{K}_{2}}S{{O}_{4}}+A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+24{{H}_{2}}O\xrightarrow[{}]{Crystallisation}\] \[\underset{potash\text{ }alum}{\mathop{{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O}}\,\]
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