A) \[{{K}^{+}},SO_{4}^{2-}\]
B) \[N{{a}^{+}},{{S}^{2-}}\]
C) \[A{{g}^{+}},NO_{3}^{-}\]
D) \[A{{l}^{3+}},O{{H}^{-}}\]
Correct Answer: D
Solution :
Aluminium is in IIIrd group and is precipitated as hydroxide \[[Al{{(OH)}_{3}}].\]
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