(A) : The law of conservation of mass holds good for all reactions.
(B) : Nuclear reactions can not proceed according to law of conservation of mass.

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R is true and A is false

Both A and R are true and R is the correct explanation of A

A is true and R is false

Both A and R are true but R is not the correct explanation of A

answer is D.

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Detailed Solution

According to law of conservation of mass, a reaction is said to be balanced when the total mass of atoms on both sides of the chemical reaction is equal. This indicates that balancing a chemical equation is an application of law of conservation of mass.
According to Law of conservation of mass, in a nuclear reaction, the total mass of the reactants or starting materials must be equal to the mass of the products. Mass conservation remains correct if energy is not lost but if energy is released in a nuclear reaction, the law of conservation of mass does not hold any good.

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