1.

Assertion. Average atomic mass of an element depends mainly on the heavier isotope. Reason. Average atomic mass is obtained by multiplying the atomic mass of the heavier isotops with its fractional abundance.

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 A. Average atomic mass depends upon the atomic MASSES of different isotopes and their FRACTIONAL abundances.
Correct R. It is obtained by MULTIPLYING atomic masses of the isotopes with their corresponding fractional abundances and then adding.


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