A) \[{{K}_{sp}}=[A{{l}^{3+}}]\,\,(SO_{4}^{2-}]\]
B) \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{2}}\,\,{{(SO_{4}^{2-}]}^{3}}\]
C) \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{3}}\,\,{{(SO_{4}^{2-}]}^{2}}\]
D) \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{2}}\,\,{{(SO_{4}^{2-}]}^{2}}\]
Correct Answer: B
Solution :
Solubility of \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] ⇌ \[2A{{l}^{+++}}+3SO_{4}^{-\,-}\] \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{2}}\,{{[SO_{4}^{2-}]}^{3}}\]
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