JEE Chemistry 2025 Question with Solution

Given: Five statements about weight, mass, volume, temperature scales, and precision are given.

Find: Which statements are correct and identify the correct option.

Analyze each statement one by one:

1. (A) Weight of a substance is the amount of matter present in it.

This is incorrect. The amount of matter present in a substance is mass. Weight is the force due to gravity acting on that mass.

2. (B) Mass is the force exerted by gravity on an object.

This is incorrect. The force exerted by gravity on an object is called weight, not mass.

3. (C) Volume is the amount of space occupied by a substance.

This is correct. Volume measures the three-dimensional space occupied by a substance.

4. (D) Temperatures below $0^\circ \text{C}$ are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.

This is correct. In the Kelvin scale, absolute zero is

$$0 \, \text{K} = -273.15^\circ \text{C}$$

and temperatures below $0 \, \text{K}$ are not possible in this context. However, Celsius temperatures can be below $0^\circ \text{C}$.

5. (E) Precision refers to the closeness of various measurements for the same quantity.

This is correct. Precision describes the consistency of repeated measurements.

Therefore, the correct statements are (C), (D) and (E) only.

The correct option is C.

Given: Statements (A) to (E) must be checked for correctness.

Find: The set of true statements.

Step 1: Analyze statement (A). Weight is not the amount of matter. Weight is the gravitational force acting on a body, whereas mass is the amount of matter present. So (A) is false.

Step 2: Analyze statement (B). Mass is a scalar quantity and does not mean gravitational force. The gravitational force on a body is its weight. So (B) is false.

Step 3: Analyze statement (C). Volume is defined as the amount of space occupied by a substance. So (C) is true.

Step 4: Analyze statement (D). The Celsius scale allows temperatures below $0^\circ \text{C}$. The Kelvin scale begins at absolute zero:

$$0 \, \text{K} = -273.15^\circ \text{C}$$

So negative Kelvin temperature is not considered possible here. Hence (D) is true.

Step 5: Analyze statement (E). Precision means closeness of repeated measurements of the same quantity to one another. So (E) is true.

Conclusion: The correct statements are (C), (D), and (E) only.

Hence, the correct option is C.