The density of a pure substance is fixed is the statements is true. Option B is correct.
Density is the amount of substance that is present n the pe unit volume of the mass which is in centimeter cube and the ratio of mass and the volume.
The density of pure substance is fixed because the composition of the chemical compound and the size of the compound of pure subatcne is fixed.
Therefore, density of a pure substance is fixed is the statements is true. Option B is correct.
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