Which of the following statement is incorrect?

Options

A. Salt Increases the density of water
B. In a dead sea no human can drown
C. When kerosene Is mixed with water It will float on the surface of water
D. Substance which will be lighter than water can sink In water

Answer

To determine which statement is incorrect, we will analyze each statement one by one.

1. **Statement 1: Salt increases the density of water.**
- When salt (sodium chloride) is dissolved in water, it increases the mass of the solution without significantly changing its volume. This results in an increase in density.
- **Conclusion:** This statement is true.

2. **Statement 2: In the Dead Sea, no human can drown.**
- The Dead Sea is known for its high salinity, which allows people to float easily. While it is difficult to drown due to the high density of the water, it is not entirely accurate to say that no human can drown.
- **Conclusion:** This statement is somewhat misleading but can be considered true in a general sense.

3. **Statement 3: Kerosene does not mix properly with water but floats on the surface.**
- Kerosene is less dense than water and does not mix with it. Instead, it forms a separate layer on top of the water.
- **Conclusion:** This statement is true.

4. **Statement 4: Substances which are lighter than water can sink.**
- This statement is incorrect. Substances that are lighter than water will float, while substances that are denser than water will sink.
- **Conclusion:** This statement is false.

After analyzing all the statements, we find that the incorrect statement is:

**Answer:** Substances which are lighter than water can sink.

---