Question

Choose the region in which the pressure decreases at room temperature.

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Case A: Pressure increases as the number of molecules increase while the volume remains constant.
Case B: Pressure increases in case of balloon. Here, both pressure and volume increases.
Case C: When a beaker is heated, the air inside expands and hence, it's volume increases and escapes the beaker. This reduces the number of molecules in the same volume of beaker and hence, decreases the pressure.
Case D: Pressure increases as the volume decreases when the piston is pushed.