EI8551-AI-UNIT 2-2.6- Quiz - Gas Chromatography

For the separation of which of the following substances, Gas-solid chromatography is being used?

• a) Thermally stable organic components

• b) Volatile organic components

• c) Thermally stable inorganic components

• d) Low molecular weight gaseous species

Which of the following is not a feature of carrier gas used in gas chromatography?

• a) It must be chemically inert

• b) It should be suitable for the detector employed

• c) It should not be completely pure

• d) It should be cheap

Which of the following is the disadvantage of hydrogen, which can be used as carrier gas in gas chromatography?

• a) Dangerous to use

• b) Expensive

• c) Reduced sensitivity

• d) High density

Which of the following is the disadvantage of helium, which can be used as carrier gas in gas chromatography?

• a) Dangerous to use

• b) Expensive

• c) Reduced sensitivity

• d) High density

Which of the following is the disadvantage of nitrogen, which can be used as carrier gas in gas chromatography?

• a) Dangerous to use

• b) Expensive

• c) Reduced sensitivity

• d) High density

Slow injection of large samples leads to band broadening and loss of resolution.

• True

• False

In which of the following methods are liquid samples injected into the column in gas chromatography?

• a) Gas tight syringe

• b) Micro-syringe

• c) Rotary sample valve

• d) Solid injection syringes

What must be done to the solid samples for it to be introduced into the column without using solid injection syringes in gas chromatography?

• a) Introduced in hot-zone of the column

• b) Dissolved in volatile liquids

• c) Introduced using rotary sample valve

• d) Introduced using sampling loops

Which of the following is the commonly used support material for the packed column in gas chromatography?

• a) Glass

• b) Metal

• c) Diatomaceous earth

• d) Stainless steel

Which of the following is the advantage of a straight packed column?

• a) It can be packed uniformly

• b) It can be repacked easily

• c) It is compact

• d) It is easier to heat it evenly