A) acidic
B) basic
C) neutral
D) amphoteric
Correct Answer: A
Solution :
The solution of potash alum is acidic as sulphuric acid (obtained by hydrolysis is strong acid while \[Al{{(OH)}_{3}}\] is a weak base. \[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\xrightarrow{{{H}_{2}}O}2{{K}^{+}}\] \[+3A{{l}^{3+}}+4SO_{4}^{2-}+24{{H}_{2}}O\]
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