Question

Arrange the following in the decreasing order of kinetic energy of molecules.
1. Steam at ${101}^{\circ }$C
2. Water at ${80}^{\circ }$C
3. Water at ${50}^{\circ }$C
4. Ice at $-{10}^{\circ }$C

• A. Steam at ${101}^{\circ }C$ > Water at ${80}^{\circ }C$ >Water at ${50}^{\circ }C$ > Ice at $-{10}^{\circ }C$.
• B. Water at ${80}^{\circ }C$ >Water at ${50}^{\circ }C$ >Steam at ${101}^{\circ }C$> Ice at $-{10}^{\circ }C$.
• C. Ice at $-{10}^{\circ }C$>Water at ${50}^{\circ }C$ >Water at ${80}^{\circ }C$ >Steam at ${101}^{\circ }C$.
• D. Steam at ${101}^{\circ }C$>Water at ${50}^{\circ }C$ >Water at ${80}^{\circ }C$ > Ice at $-{10}^{\circ }C$.

Answer 1

The correct option is A Steam at ${101}^{\circ }C$ > Water at ${80}^{\circ }C$ >Water at ${50}^{\circ }C$ > Ice at $-{10}^{\circ }C$.

The temperature of a substance is a measure of the average kinetic energy of its molecules. Atoms vibrate faster at higher temperature and faster the vibration of atoms, more is its kinetic energy. Thus, the kinetic energy of molecules are as follows -
Steam at ${101}^{\circ }C$ > Water at ${80}^{\circ }C$ >Water at ${50}^{\circ }C$ > Ice at $-{10}^{\circ }C$.