Assertion: Addition of $N H_{4} O H$ to an aqueous solution of $B a C l_{2}$ in the presence of excess $N H_{4} C l$ precipitates $B a (O H)_{2}$ .
Reason: $B a (O H)_{2}$ is soluble in water.

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion

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Assertion is correct but Reason is not correct

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Assertion is not correct but Reason is correct

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Both Assertion and Reason are not correct

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Solution

The correct option is D Assertion is not correct but Reason is correct
Barium hydroxide is soluble in water because its lattice energy is less than its hydration energy.
When ammonium hydroxide is added to a solution of barium chloride in presence of excess ammonium chloride, the precipitate of barium hydroxide is formed because the ionic product of barium hydroxide exceeds its solubility product.

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Assertion: Addition of NH4OH to an aqueous solution of BaCl2 in the presence of excess NH4Cl precipitates Ba(OH)2.Reason: Ba(OH)2 is soluble in water.

Assertion: Addition of $N H_{4} O H$ to an aqueous solution of $B a C l_{2}$ in the presence of excess $N H_{4} C l$ precipitates $B a (O H)_{2}$ .
Reason: $B a (O H)_{2}$ is soluble in water.