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Which of the following statements are co...

Which of the following statements are correct ?

A

Both surface tension and viscosity decrease with increase of temperature.

B

There is no difference between normal boiling point and standard boiling point.

C

When a liquid boils, the vapours are formed only from the surface.

D

Glass is a highly viscous liquid.

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are correct, we will analyze each statement one by one based on the principles of chemistry related to states of matter, specifically focusing on surface tension, viscosity, boiling points, and the properties of glass. ### Step-by-Step Solution: 1. **Statement 1: Both surface tension and viscosity decrease with an increase in temperature.** - **Analysis:** As the temperature increases, the kinetic energy of the particles in a liquid also increases. This increase in kinetic energy allows the particles to move more freely, which reduces both surface tension and viscosity. Therefore, this statement is **correct**. 2. **Statement 2: There is no difference between normal boiling point and standard boiling point.** - **Analysis:** The normal boiling point of a substance is defined as the temperature at which it boils at 1 atmosphere of pressure (normal conditions). The standard boiling point is defined under standard conditions, which can vary. Therefore, there is a difference between the two. This statement is **incorrect**. 3. **Statement 3: When a liquid boils, the vapors are formed only from the surface.** - **Analysis:** When a liquid boils, vaporization occurs not only at the surface but throughout the liquid as well. Bubbles of vapor form within the liquid, not just at the surface. Thus, this statement is **incorrect**. 4. **Statement 4: Glass is a highly viscous liquid.** - **Analysis:** Glass is often described as a supercooled liquid or an amorphous solid. It has a very high viscosity, which means it flows very slowly. This statement is **correct**. ### Conclusion: - The correct statements are: - Statement 1: Correct - Statement 2: Incorrect - Statement 3: Incorrect - Statement 4: Correct Thus, the correct statements are **1 and 4**.
To determine which statements are correct, we will analyze each statement one by one based on the principles of chemistry related to states of matter, specifically focusing on surface tension, viscosity, boiling points, and the properties of glass. ### Step-by-Step Solution: 1. **Statement 1: Both surface tension and viscosity decrease with an increase in temperature.** - **Analysis:** As the temperature increases, the kinetic energy of the particles in a liquid also increases. This increase in kinetic energy allows the particles to move more freely, which reduces both surface tension and viscosity. Therefore, this statement is **correct**. 2. **Statement 2: There is no difference between normal boiling point and standard boiling point.** ...
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