A) \[Ba{{(OH)}_{2}}\]
B) \[Mg{{(OH)}_{2}}\]
C) \[{{K}^{+}},\,HCO_{3}^{-}\]
D) \[Ca{{(OH)}_{2}}\]
Correct Answer: A
Solution :
\[\xrightarrow[Solubility\text{ }decreasing\text{ }order.]{Ba{{(OH)}_{2}}>Sr{{(OH)}_{2}}>Ca{{(OH)}_{2}}>Mg{{(OH)}_{2}}}\]
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