Questions and answers for exam Preparation

MCQs

Total Questions : 136 | Page 1 of 14 pages

Question 1. Which of the following equations give the expression for plate number, N when ‘tR’ is the adjusted retention time and ‘Wb’ is the width at the base of the peak which is equal to 4 standard deviations.

16 tR²/Wb
4 tR²/Wb
(4tR/Wb)²
4 (tR/Wb)²

Discuss Question

Answer: Option C. -> (4tR/Wb)²
Answer: (c).(4tR/Wb)²

Question 2. It is more difficult to measure the width at half peak height than the base width in the detector output.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option B. -> False
Answer: (b).False

Question 3. The solute, while moving in the column is always in equilibrium with both the stationary phase and the mobile phase.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 4. For the separation of which of the following substances, Gas-solid chromatography is being used?

Thermally stable organic components
Volatile organic components
Thermally stable inorganic components
Low molecular weight gaseous species

Discuss Question

Answer: Option D. -> Low molecular weight gaseous species
Answer: (d).Low molecular weight gaseous species

Question 5. Which of the following is not a feature of carrier gas used in gas chromatography?

It must be chemically inert
It should be suitable for the detector employed
It should not be completely pure
It should be cheap

Discuss Question

Answer: Option C. -> It should not be completely pure
Answer: (c).It should not be completely pure

Question 6. Which of the following properties of molecular sieves make it ideal for exclusion mechanism of separation?

High thermal stability
Large inner surface area
Variable framework charge
Ability to distinguish materials on the basis of their size

Discuss Question

Answer: Option D. -> Ability to distinguish materials on the basis of their size
Answer: (d).Ability to distinguish materials on the basis of their size

Question 7. Which of the following is the disadvantage of reciprocating pump used in liquid chromatography?