question archive During the titration of weak acid by a strong base, the indicator that can be used is: a
During the titration of weak acid by a strong base, the indicator that can be used is: a
Subject:ChemistryPrice: Bought3
During the titration of weak acid by a strong base, the indicator that can be used is:
a. Methyl Red
b. Phenolphthalein
c. Methyl Orange
d. Bromothymol Blue
The main advantage in using open tubular columns (vs. packed columns) in GC is:
a. increased analyte capacity
b. high efficiency (plate number)
c. better selectivity
d. lower cost
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
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 an ideal property of a primary standard?
a. Must have an intermediate molar mass
b. High purity
c. Absence of hydrate water
d. Soluble in titration medium.
You are tasked to determine the amount of organophosphorus in a water sample which flows to a known reservoir. Which detector is best to use for the analysis of the said water sample?
a. Thermionic detector
b. Electron capture detector
c. Thermal conductivity detector
d. Flame ionization detector
Which chromatographic technique depends on the highly specific interactions between pairs of biological materials such as enzyme-substrate?
a. Adsorption chromatography
b. Ion-exchange chromatography
c. Affinity chromatography
d. Gel-permeation chromatography
A chromatogram is a plot of signal intensity versus ____
a. Concentration
b. Peak area
c. Temperature
d. Retention time
We can minimize supersaturation by lowering the temperature of the solution thus increasing the solubility of the precipitate.
TRUE
FALSE
Which of the following chromatographic techniques utilizes a porous gel wherein molecules are separated by its size?
a. Molecular exclusion chromatography
b. Affinity chromatography
c. Ion exchange chromatography
d. Partition chromatography
In electrophoresis, DNA will migrate towards
a. Cathode or positive electrode
b. Anode or negative electrode
c. Cathode or negative electrode
d. Anode or positive electrode
