Assertion :When $10$ g of $C a C O_{3}$ is decomposed, $5.6$ g of residue is left and $4.4$ g of $C O_{2}$ escapes. Reason: Law of mass conservation is followed.

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
According to the Law of mass conservation, the total mass of products is equal to the total mass of reactants in a chemical reaction.
The total mass of reactants is $10$ g.
The total mass of products is $5.6$ g $+ 4.4$ g $= 10$ g.
Thus, the total mass of products is equal to the total mass of reactants.
Hence, the law of mass conservation is followed.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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