1.

Assertion. Atomic mass of sodium is 23 u. Reason. An atom of sodium is 23 times heavier than an atom of carbon-12 isotope.

Answer»

If both assertion and reason are TRUE, and reason is the true explanation of the assertion.
If both assertion and reason are true, but reason is not the true explanation of the assetion.
If assertion is true, but reason if false
If both assertion and reason are false.

Solution :Correct R. An atom of SODIUM is 23 TIMES heavier than `(1)/(12)TH` of the mass of an atom of carbon - 12 isotope.


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