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# Analytical Methods (College)

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## Analytical Methods

1.
Which of the following represents the mobile phase utilized in paper chromatography?
1. filter paper
2. the developing solution
3. the ink samples
4. silica gel backing
2.
What is the stationary phase of paper chromatography?
1. Thin film of liquid supported on a paper
2. Liquid phase impregnated on an inert solid support
3. Thin layer of solid adsorbent
4. Solid adsorbents like silica and alumina
3.
Which of the following equations correctly represents the equation for the retention factor?
1. $R_f = "distance of solvent"/"distance of substance"$
2. $R_f="distance of substance"/"distance of solution"$
3. $R_f="distance of substance"/"distance of solvent front"$
4. None of the above
4.
Which of the following is an example of column chromatography?
1. Ion-exchange chromatography
2. Gas-solid chromatography
3. Thin layer chromatography
4. Gas-liquid chromatography
5.
What is the size of nucleation clusters?
1. $10^(-10)$ to $10^(-9)$ m
2. $10^(-11)$ to $10^(-8)$ m
3. $10^(-6)$ to $10^(-3)$ m
4. $10^(-12)$ to $10^(-13)$ m
6.
Which of the following is a replaceable ion for the cation exchanger?
1. Hydrogen ion
2. Chloride ion
3. Hydroxice ion
4. Nitrate ion
7.
Consider the following polymeric group that is used as an anion exchanger:

$R-N(CH_3)_3^(+) Cl^(-)$

where R = alkyl group

Identify the labile ion in this anion exchanger.
1. $CH_3$
2. $Cl^(_)$
3. $R$
4. $R-N(CH_3)_3^(+)$
8.
Which of the following terms explains why a liquid will move up a column in thin-layer chromatography?
1. repulsion
2. dispersion
3. capillary action
4. viscosity
9.
Beer's Law states that the absorbance and concentration of a substance are inversely proportional to one another.
1. True
2. False
10.
At a concentration of 0 M, the absorbance of a substance is 0.056. At a concentration of 0.5 M, the absorbance of a substance is 0.38. Based on this data, write an appropriate equation for the best-fit line that demonstrates Beer's Law. Assume that concentration=x.

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