Assertion :The ratio weights of carbon and oxygen in $C O_{2}$ is $3 : 8$ and it is a constant. Reason: The atomic weights of carbon and oxygen are a constant.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The atomic weight of Carbon atom=12
The atomic weight of Oxygen atom=16
Hence the atomic weight of carbon and oxygen atoms are constant
In $C O_{2}$ , the mass of carbon is 12 whereas that of oxygen is 32. Hence the ratio of their masses is $12 : 32 = 3 : 8$

However, this fact is not justified by the constant atomic mass of carbon and oxygen. Hence both the statements are correct but the reason is not a correct explanation for the assertion

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Assertion :The ratio weights of carbon and oxygen in CO2 is 3:8 and it is a constant. Reason: The atomic weights of carbon and oxygen are a constant.

Assertion :The ratio weights of carbon and oxygen in $C O_{2}$ is $3 : 8$ and it is a constant. Reason: The atomic weights of carbon and oxygen are a constant.