Assertion :Both $106 g$ of sodium carbonate and $12 g$ of graphite have same number of carbon atoms. Reason: Both $106 g$ sodium carbonate and $12 g$ of graphite contain $1 g$ atom of 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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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
Gram molecular mass of sodium carbonate $N a_{2} C O_{3} = 106 g$
Gram atomic mass of carbon $C = 12 g$

106 g of sodium carbonate and 12 g of graphite have 1 mole of atoms of carbon.

Hence, option A is correct.

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Assertion :Both 106 g of sodium carbonate and 12 g of graphite have same number of carbon atoms. Reason: Both 106 g sodium carbonate and 12 g of graphite contain 1 g atom of carbon atoms.

Assertion :Both $106 g$ of sodium carbonate and $12 g$ of graphite have same number of carbon atoms. Reason: Both $106 g$ sodium carbonate and $12 g$ of graphite contain $1 g$ atom of carbon atoms.