In older analytical methods, which of the following methods were used to allow movement of the mobile phase?(a) Pumps(b) Pressure(c) Gravity(d) Blowing air into the columnThis question was posed to me in a job interview.My question is taken from Operation of Chromatography in chapter Chromatography of Analytical Instrumentation

In older analytical methods, which of the following methods were used

1.	In older analytical methods, which of the following methods were used to allow movement of the mobile phase?(a) Pumps(b) Pressure(c) Gravity(d) Blowing air into the columnThis question was posed to me in a job interview.My question is taken from Operation of Chromatography in chapter Chromatography of Analytical Instrumentation
Answer» The CORRECT ANSWER is (c) GRAVITY The best I can explain: In OLDER analytical methods, gravity facilitated the movement of the mobile phase. The effect of capillary action was also employed to allow movement.

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