Q 3047845783.    

Assertion : Mendeleev's periodic table have some demerits.

Reason : There was no place for all isotopes of the elements and some heavy elements were placed before lighter elements.

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

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