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Question

Assertion :Sodium and potassium carbonates are soluble in water but magnesium and calcium carbonates are insoluble in water. Reason: Lattice energy of Mg and Ca carbonates is much higher than sodium and potassium carbonate.


A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sodium and potassium carbonates are soluble in water but magnesium and calcium carbonates are insoluble in water, because lattice energy of Mg and Ca carbonates is much higher than sodium and potassium carbonate. For solubility condition lattice energy must be less than the hydration energy. So, both assertion and reason are correct and reason is the correct explanation for assertion. Hence option A is correct.

Chemistry

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