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Which one of the following is incorrect?

1.	A chemical equation is balanced in the sense that the number of atoms of each element is the same on both sides of the equation.
2.	The number of atoms of each element is not necessarily conserved in a nuclear reaction.
3.	The number of protons and the number of neutrons are conserved in each nuclear reaction.
4.	Mass-energy interconversion takes place only in nuclear reactions and never in the chemical reaction.

Subtopic: Nuclear Energy |

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