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Which of the following is not a disadvantage of Pneumatic pumps used in liquid chromatography?

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Which of the following is not a disadvantage of Pneumatic pumps used in liquid chromatography?

(a) Pulsed output

(b) Dependent on solvent viscosity

(c) Dependent on back pressure

(d) Inconvenient for solvent gradient elution

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This intriguing question originated from Liquid Chromatography in portion Chromatography of Analytical Instrumentation

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Right answer is (a) Pulsed output

Explanation: Pneumatic pumps provide pulse free output. They are inexpensive.

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