A stripper is unable to obtain the specified purity of outlet liquid. Outlet liquid impurity concentration can be decreased (which might allow one to reach or exceed specified purity) by doing which of the following changes? Circle all correct answers. There are five correct answers - one in each pair \((1,2,3,4\), 5). Note: Think of this as doing each change by itself and determine whether it decreases concentration of impurity in outlet liquid.

1.

a. Increase inlet gas flow rate.

b. Decrease inlet gas flow rate.

2.

c. Increase inlet liquid flow rate

d. Decrease inlet liquid flow rate.

3.

e. Increase number of stages.

f. Decrease number of stages.

4. g. Increase column pressure.

h. Decrease column pressure.

5. i. Increase temperature of inlet gas and inlet liquid.

j. Decrease temperature of inlet gas and inlet liquid.