Question

Which of the following statement(s) is/are true about relative density?
Statement 1: Relative density is known as the specific gravity of the substance.
Statement 2: Relative density of a substance is the ratio of the density of the substance to the density of water at $4^{\circ }C$.
Statement 3: Relative density of a substance is the ratio of the mass of water at $4^{\circ }C$ to the mass of a substance at $4^{\circ }C$.
Statement 4: Relative density is unitless.

• A. Statement 1 and Statement 3 is correct.
• B. Statement 2 and Statement 3 is correct.
• C. Statement 1, Statement 2 and Statement 4 are correct.
• D. All the above Statements are correct.

Answer 1

Answer: (A), (B), (D)

The correct options are
A Statement 1 and Statement 3 is correct.
B Statement 2 and Statement 3 is correct.
D All the above Statements are correct.

The relative density of a substance is defined as the ratio of the density of the substance to the density of water at $4^{\circ }C$. Relative density is also known as the specific gravity of the substance. The relative density of a substance can also be defined as the ratio of the mass of a substance to the mass of the water if the volume of water at $4^{\circ }C$ and volume of substance is same. Since relative density is the ratio of two densities, thus it has no unit.