Question

As you increase the gas chromatography column temperature, analytes’ ______________ increases and stationary phase solubility _______________.

A) boiling point; increases

B) vapor pressure; decreases

C) vapor pressure; increases

D) retention time; increases

E) retention time; decreases

Answer 1

As we increase the temperature of the column the retention time of the sample decreases and it elutes out of the column easily

So due to this reason we can't have option D and E for this

Then we have boiling point as we should know increasing the temperature doesn't affect boiling point of any substance so the option A is also not true

Then we have remaining 2 options B and C

And yes vapour pressure do tend to Increase with increase in the temperature and it is also observed that with increasing temp the stationary phase solubility decrease allowing faster elution and shorter retention time

So the answer for this problem is

B vapour pressure, decreases

I hope this helps. If you have any query or want more detailed explanation, feel free to ask in the comments section below.

Answer 2

b is the correct option