Questions and answers for exam Preparation

MCQs

Total Questions : 147 | Page 4 of 15 pages

Question 31. HPLC stands for

High Pressure Liquid Chromatography
High Performance Liquid Chromatography
both (a) and (b)
Highly Placed Liquid Chromatography

Discuss Question

Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)

Question 32. HPLC methods include

liquid/liquid (partition) chromatography
liquid/solid (adsorption) chromatography
ion exchange and size exclusion chromatography
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 33. The eluent strength is a measure of

solvent adsorption energy
solvent absorption energy
solvent diffusivity
solvent mixing index

Discuss Question

Answer: Option A. -> solvent adsorption energy
Answer: (a).solvent adsorption energy

Question 34. Column efficiency is measured in terms of number of plates which is

inversely related to the square of the peak width
directly related to the square of the peak width
inversely related to the cube root of the peak width
directly related to the square of the peak width

Discuss Question

Answer: Option A. -> inversely related to the square of the peak width
Answer: (a).inversely related to the square of the peak width

Question 35. For a typical adsorbent such as silica gel, the most popular pore diameters are

10 and 50 A°
60 and 100 A°
100 and 150 A°
150 and 200 A°

Discuss Question

Answer: Option B. -> 60 and 100 A°
Answer: (b).60 and 100 A°

Question 36. What is shielding in NMR?

Using a curved piece of metal to block an opponents attack
Putting metal around an Rf source
When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
Blocking parts of a molecule from Rf radiation

Discuss Question

Answer: Option C. -> When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
Answer: (c).When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

Question 37. When placed in a magnetic field, all the random spins of the nuclei

stop
reverse direction
align with the magnetic field
rotate to 90° away from the induced field

Discuss Question

Answer: Option C. -> align with the magnetic field
Answer: (c).align with the magnetic field

Question 38. Coupling causes the peaks in 1H NMR spectra to be split into

two peaks
multiple peaks equal to the number of hydrogens on surrounding atoms
multiple peaks equal to the number of surrounding carbon atoms
multiple peaks equal to the number of hydrogen on surrounding atoms, plus one

Discuss Question

Answer: Option D. -> multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
Answer: (d).multiple peaks equal to the number of hydrogen on surrounding atoms, plus one

Question 39. Better understanding of the nuclei is possible,

with the help of wavelength spectrum
with the help of frequencies ranges
with the help of a mathematical translator called the fourier transfer algorithm
none of the above

Discuss Question

Answer: Option C. -> with the help of a mathematical translator called the fourier transfer algorithm
Answer: (c).with the help of a mathematical translator called the fourier transfer algorithm

Question 40. What is used to cool the superconducting coil?