Assertion :Both $138$ g of $K_{2} C O_{3}$ and $12$ g of carbon have same number of carbon atoms. Reason: Both contain $1$ g atom of carbon which contains $6.022 \times 10^{23}$ carbon atoms.

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
The molar mass of $K_{2} C O_{3}$ is $138$ g/mol and the molar mass of C is $12$ g/mol.

Both $138$ g of $K_{2} C O_{3}$ and $12$ g of carbon have the same number of carbon atoms.

Both contain $1$ g atom of carbon which contains $6.022 \times 10^{23}$ carbon atoms.

Thus, Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Hence, option $A$ is correct.

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Assertion :Both 138 g of K2CO3 and 12 g of carbon have same number of carbon atoms. Reason: Both contain 1 g atom of carbon which contains 6.022×1023 carbon atoms.

Assertion :Both $138$ g of $K_{2} C O_{3}$ and $12$ g of carbon have same number of carbon atoms. Reason: Both contain $1$ g atom of carbon which contains $6.022 \times 10^{23}$ carbon atoms.