Question

14) Increasing the temperature of the column in GC lead to:

A) Increase the retention time of the compounds B) Decrease the retention time of the compounds C) Does not affect on the peak shape

D) Increase the broadening of the peaks

E) Does not affect on the retention time of the compounds

Answer 1

increasing the temperature of the column in GC leads to a decrease in the retention time of the compounds.

option B is correct.

explanation: as the column temperature increases it results in very short retention time and also a very poor separation because all components mainly stay in the gas phase .if the compound does not interact with the stationary phase, the retention time will decrease. the best separations are usually observed for temperature gradients because of the difference in the polarity and in the boiling points of the compounds.