A) Ferric alum
B) Chrome alum
C) Potash alum
D) Ammonium alum
Correct Answer: C
Solution :
\[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] Potash alum is generally used for purifying water.
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