Assertion :A solution containing $C a^{2 +} (a q)$ and $H C O_{3}^{-} (a q)$ ions is said to be hard. Reason: The $C a^{2 +}$ ions give precipitates (scum) with soaps. On heating the $H C O_{3}$ ions revert to $C O_{3}^{2 -}$ which gives a precipitate with $C a^{2 +}$ ions.

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

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

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Assertion is correct but Reason is incorrect

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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
The $C a^{2 +}$ ions give precipitates (scum) with soaps. On heating the $H C O_{3}$ ions revert to $C O_{3}^{2 -}$ which gives a precipitate with $C a^{2 +}$ ions:
$C a (H C O_{3})_{2} \to C a C O_{3} + H_{2} O + C O_{2}$
So Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hence option A is correct.

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Assertion :A solution containing Ca2+(aq) and HCO−3(aq) ions is said to be hard. Reason: The Ca2+ ions give precipitates (scum) with soaps. On heating the HCO3 ions revert to CO2−3 which gives a precipitate with Ca2+ ions.

Assertion :A solution containing $C a^{2 +} (a q)$ and $H C O_{3}^{-} (a q)$ ions is said to be hard. Reason: The $C a^{2 +}$ ions give precipitates (scum) with soaps. On heating the $H C O_{3}$ ions revert to $C O_{3}^{2 -}$ which gives a precipitate with $C a^{2 +}$ ions.