Assertion :One mole of a substance always contain the same number of entities, no matter what the substance may be. Reason: One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly $12$ g of the $^{12} C$ isotope.

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
One mole of a substance always contains the same number of entities, no matter what the substance may be which is $6.022 \times 10^{23}$ . This is also the number of atoms present in 12 g of $_{12} C$ isotope.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
option $A$ is correct

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Choose the correct option.

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