NEW
Font size
S
M
L
XL
WorksheetsQC2 Lab - Ex.11-15
Total questions: 40
Worksheet time: 20mins
Name
Class
Date
1.
A branch of electrochemistry which deals with the study and measurement of electrode potential
a)
Polarography
b)
Potentiometry
c)
Refractometry
d)
Chromatography
2.
A method of analysis based on the measurement of current resulting from the electrolysis of an electroactive species at a given electrode potential under controlled conditions
a)
Polarography
b)
Potentiometry
c)
Refractometry
d)
Chromatography
3.
It deals with the study and measurement of index of refraction of substances in order to assess their composition of purity
a)
Polarography
b)
Potentiometry
c)
Refractometry
d)
Chromatography
4.
It deals with the study of the rotatory power of substances
a)
Polarimetry
b)
Refractometry
c)
Potentiometry
d)
NMR
5.
A method that deals with the transitions between energy levels that are generated by radiant energy after subjecting the molecules in a magnetic field
a)
Polarimetry
b)
Refractometry
c)
Potentiometry
d)
NMR
6.
The type of chromatography where the cellulose of paper is used as the adsorbent
a)
Column chromatography
b)
Paper chromatography
c)
Thin layer chromatography
d)
Gas chromatography
7.
It is used in the analysis of volatile substances.
a)
Column chromatography
b)
Paper chromatography
c)
Thin layer chromatography
d)
Gas chromatography
8.
It is defined as the ratio of velocity of light in air to the velocity of light in the medium or the ration of the sine of angle of incidence to the sine of angle of refraction:
a)
Angle of rotation
b)
Specific rotation
c)
Index of refraction
d)
Optical activity
9.
For a liquid, it is defined as the angular rotation in degrees through which the plane of polarization of polarized monochromatic light is rotated by passage through 1 dm or 100 mm of the liquid, calculated on the basis of specific gravity of 1.0.
a)
Angle of rotation
b)
Specific rotation
c)
Index of refraction
d)
Optical activity
10.
In paper chromatography, the data needed to compute the Rf value is/are:
a)
Distance traveled by the solute
b)
Distance traveled by the solvent
c)
Both
d)
None
11.
In TLC, the separation takes place on a planar surface by:
a)
Capillary action
b)
Relative solubility
c)
Molecular size
d)
Differential migration
12.
Gypsum in silica gel G is used as:
a)
Disintegrant
b)
Dessicant
c)
Binder
d)
Diluent
13.
Wavelength used in all polarimetric measurements.
a)
598 nm
b)
589 um
c)
859 um
d)
589 nm
14.
Used to measure the optical activity of liquid substances.
a)
pH meter
b)
Polariscope
c)
Refractometer
d)
Potentiometer
15.
The following are optical methods of analysis, EXCEPT:
a)
Flame spectroscopy
b)
Colorimetry
c)
Turbidimetry
d)
Chromatography
16.
Potentiometry finds application in:
a)
Biologic assay
b)
pH determination
c)
Qualitative assay
d)
Toxicity testing
17.
Colorimetric methods of analysis are absorptimetric methods that utilizes the ______ region of the spectrum.
a)
Ultraviolet
b)
Visible
c)
Infrared
d)
All of the above
18.
What is the most popular indicator electrode used in pH determination?
a)
Quinhydrone electrode
b)
Glass electrode
c)
Ag/AgCl electrode
d)
Calomel electrode
19.
The following are the principal objectives of chromatography, EXCEPT:
a)
Resolution of mixtures into constituent parts
b)
Comparison of substances suspected of being identical
c)
Dilution of substances from concentrated solutions
d)
Purification of samples
20.
What is the reference electrode used in polarography?
a)
Saturated calomel electrode
b)
Glass electrode
c)
Dropping mercury electrode
d)
Quinhydrone electrode
21.
Which of the following is NOT a principle of separation in chromatography?
a)
Absorption
b)
Adsorption
c)
Partition
d)
Ion-exchange
22.
What instrument is used to determine the position of the separated radioactive components following chromatography?
a)
Geiger-Muller counter
b)
Spraying with colored solutions
c)
Use of iodine vapors
d)
Charring
23.
A type of paper chromatography which is accomplished by allowing the mobile phase to rise upward following capillary attraction.
a)
Ascending chromatography
b)
Descending chromatography
c)
Radial chromatography
d)
All of the above
24.
Which chromatographic technique is used in the separation of water-insoluble substances like steroids?
a)
Adsorption chromatography
b)
Partition chromatography
c)
Reversed-phase chromatography
d)
Ion-exchange chromatography
25.
A substance that rotates plane polarized light to the right is designated as
a)
Dextrorotatory
b)
Levorotatory
c)
Optically active
d)
All of the above
26.
Which among the chromatographic technique separates constituents of the sample based on the molecular size?
a)
Gel-filtration
b)
Reversed-phase
c)
Adsorption
d)
Partition
27.
1. A type of chromatography that involves the spotting of a sample of a mixture of components at one end of an adsorbent-coated glass plate followed by passage of a solvent through the adsorbent for the purpose of separating the components of the sample.
a)
Column chromatography
b)
Liquid chromatography
c)
Thin layer chromatography
d)
Paper chromatography
28.
The prism that is used in examining the polarized light is called the:
a)
Polarizer
b)
Diffraction grating
c)
Analyzer
d)
Nicol prism
29.
The inert gas used as mobile phase in gas chromatography is referred to as:
a)
Vehicle gas
b)
Carrier gas
c)
Gas substrate
d)
All of the above
30.
It refers to the time required by an average molecule of component to pass from the injection point through the column to the detector.
a)
Retention factor
b)
Retention volume
c)
Retention time
d)
Any of the above
31.
Which of the following is NOT an advantage of HPLC?
a)
Precise
b)
Slow separation
c)
Accurate
d)
Ease of operation
32.
What is the prerequisite for solvents used in high pressure liquid chromatography?
a)
Free from protons
b)
HPLC grade
c)
Degassed
d)
All of the above
33.
This refers to the fixed phase in a chromatographic process:
a)
Mobile phase
b)
Stationary phase
c)
Fixed phase
d)
Solute phase
34.
Stationary phase:
I. The fixed phase in chromatography
II. A porous or finely divided solid or a liquid that has been coated in a thin layer on an inert supporting material
III. The particles should be small and homogenous so as to provide a large surface area so that sorption and desorption of the solutes will occur frequently and efficiently
I. The fixed phase in chromatography
II. A porous or finely divided solid or a liquid that has been coated in a thin layer on an inert supporting material
III. The particles should be small and homogenous so as to provide a large surface area so that sorption and desorption of the solutes will occur frequently and efficiently
a)
I only
b)
III only
c)
II and III
d)
I, II and III
35.
It is the universal detector used in gas chromatography since it responds to all types of solutes.
a)
Flame ionization detector
b)
Thermal conductivity detector
c)
Electron capture detector
d)
Thermoionic specific detector
36.
A detector in gas chromatography which is most frequently used because it is highly sensitive, is able to detect microgram quantities of solutes and is an almost universal detector.
a)
FID
b)
TCD
c)
NPD
d)
TSD
37.
What is the strongest adsorbent used in column chromatography?
a)
Charcoal
b)
Alumina
c)
Silica gel
d)
Calcium carbonate
38.
Which of the following methods can be performed to remove unwanted gases of the mobile phase used in HPLC?
a)
Used of a vacuum
b)
Sonication
c)
Sparging with helium
d)
All of the above
39.
What part of the HPLC instrument is used to contain the mobile phase?
a)
Reservoir
b)
Pump
c)
Injector port
d)
Analytical column
40.
What part of the HPLC component is used to force the mobile phase through the column?
a)
Reservoir
b)
Pump
c)
Injector port
d)
Analytical column
Reset
