Assertion :The ratio of atomic weights of carbon and oxygen in $C O_{2}$ is $3 : 8$ and it is constant. Reason: The atomic weights of carbon and oxygen are 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Due to the law of constant proportion, the mass ratio in which the reactants will react will remain constant.

In $C O_{2}$ ,

Mass of carbon is $12$

Mass of Oxygen is $16 \times 2 = 32$

So, the ratio of atomic weight of carbon and oxygen is $\frac{12}{32} = \frac{3}{8}$ .

Hence, option $A$ is correct.

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

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