Which of the following statements is incorrect?
- AThe amount of substance of a system which contains as many elementary entities as there are atoms in $0.012 \ kg$ of carbon-$12$ is known as one mole.
- BAccording to Avogadro's law,equal volumes of gases at the same temperature and same pressure should contain equal number of molecules.
- CAccording to Dalton's atomic theory,chemical reactions involve the reorganization of atoms. These are neither created nor destroyed in a chemical reaction.
- DThe mass of one mole of a substance in milligrams is called its molar mass.
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