Question

Consider the following gaseous sample in a cylinder fitted with a movable piston. Initially there are n moles of the gas at temperature T, pressure P, and volume V. Choose the cylinder that correctly represents the gas after each of the following changes.

Note 1: The degree of shading of the samples represents the gas concentration (i.e., darker red = more concentrated).
Note 2: A figure/letter can be used more than once.

A) The pressure on the piston is tripled at constant n and T.                            [ Select ]                       ["A", "C", "D", "B"]      

B) The temperature is doubled at constant n and P.                            [ Select ]                       ["D", "B", "C", "A"]      

C) At constant T and P, n more moles of gas are added.                            [ Select ]                       ["B", "C", "A", "D"]      

D) Temperature is halved at constant P.                            [ Select ]                       ["C", "B", "A", "D"]