Liquid State

Step 1: Understanding the Concept:
Properties of liquids vary with temperature. Viscosity is the resistance to flow.

Step 2: Detailed Explanation:
• (A) Correct: As temperature increases, molecular kinetic energy increases, overcoming intermolecular forces, so surface tension decreases. • (B) Incorrect: As temperature decreases, molecular kinetic energy decreases, intermolecular forces become more significant, and viscosity increases. So, viscosity decreases with an increase in temperature, not a decrease. • (C) Correct: As temperature increases, more molecules have enough energy to escape the liquid phase, so vapor pressure increases. • (D) Correct: Gravity pulls on the liquid droplet, causing it to flatten slightly, especially if it's large.

Step 3: Final Answer:
The incorrect statement is that viscosity decreases with a decrease in temperature, which corresponds to option (B).