Instrumental Multiple Choice Questions with verified
answers
a chromatography separation is
a.) purely thermodynamically controlled
b.) predominantly kinetically controlled
c.) associated always with exchange of electrons
d.) generally independent upon the temperature
e.) all of the above apply Ans✓✓✓ b.) predominantly kinetically
controlled
A circuit with resistor (R) and capacitor (C) connected in series
A) will run 63% lower current than the initial one after 5τ of charging
B) will run 63% higher current than the initial one after 5τ of charging
C) will run 99.3% lower current than the initial one after 5τ of charging
D) will run 93.3% lower current than the initial one after 5τ of charging
E) none of the above Ans✓✓✓ C) will run 99.3% lower current than the
initial one after 5τ of charging
a key step associated with a mass spectrometry/spectroscopy
experiment is
a.) separate the ions based on their mass
b.) detect only isotopes with higher-than-average mass
,c.) generate molecules in the state of supercritical fluid from the
analyte of interest
d.) neutralize any charged particles once brought in gas-phase before
the detection
e.) all of the above are indispensible for the MS analysis Ans✓✓✓ a.)
separate the ions based on their mass
a large ensemble of perfectly identical photo-sensitive atoms studied at
room temperature would produce a spectrum consisting of most likely:
a.) broad symmetric (Gaussian peaks)
b.) very high, ultra-narrow, and symmetric peaks
c.) pure spectral lines (100% homogeneity, also known as Dirac
function)
d.) very high and narrow but clearly asymmetric peaks
e.) any of the above is possible; just depends on the nature of the
atoms
f.) none of the above Ans✓✓✓ b.) very high, ultra narrow, and
symmetric peaks
A powerpoint presentation is intended in a room with the brightest
screen available. Which laser pointer will be best to overcome the
screen emission intensity and guarantee the purpose of pointing?
a.) red
b.) green
c.) blue
, d.) doesn't matter - all will do the same
e.) it depends strongly on the humidity of the room Ans✓✓✓ c.) blue
a spontaneous redox/electrochemical reaction will be one that features
a.) ΔG<0 and Wel(EMF)=0
b.) ΔG<0 and Wel(EMF)>0
c.) ΔG<0 and Wel(EMF)<0
d.) ΔG=0 and Wel(EMF)=0
e.) ΔG>0 and Wel(EMF)<0 Ans✓✓✓ b.) ΔG<0 and Wel(EMF)>0
Absorption is
A) a physical process in which a gaseous or liquid compound penetrates
into the bulk of the solid
B) a chemical process in which a gaseous compound converts
specifically in a liquid on the surface of the solid
C) a physical process in which a gaseous or liquid compound forms a
layer on the surface of the solid
D) a chemical process in which a gaseous or liquid compound
undergoes redox changes on the surface of the solid
E) All of the above Ans✓✓✓ A) a physical process in which a gaseous
or liquid compound penetrates into the bulk of the solid
According to Kirchhoff's current law
answers
a chromatography separation is
a.) purely thermodynamically controlled
b.) predominantly kinetically controlled
c.) associated always with exchange of electrons
d.) generally independent upon the temperature
e.) all of the above apply Ans✓✓✓ b.) predominantly kinetically
controlled
A circuit with resistor (R) and capacitor (C) connected in series
A) will run 63% lower current than the initial one after 5τ of charging
B) will run 63% higher current than the initial one after 5τ of charging
C) will run 99.3% lower current than the initial one after 5τ of charging
D) will run 93.3% lower current than the initial one after 5τ of charging
E) none of the above Ans✓✓✓ C) will run 99.3% lower current than the
initial one after 5τ of charging
a key step associated with a mass spectrometry/spectroscopy
experiment is
a.) separate the ions based on their mass
b.) detect only isotopes with higher-than-average mass
,c.) generate molecules in the state of supercritical fluid from the
analyte of interest
d.) neutralize any charged particles once brought in gas-phase before
the detection
e.) all of the above are indispensible for the MS analysis Ans✓✓✓ a.)
separate the ions based on their mass
a large ensemble of perfectly identical photo-sensitive atoms studied at
room temperature would produce a spectrum consisting of most likely:
a.) broad symmetric (Gaussian peaks)
b.) very high, ultra-narrow, and symmetric peaks
c.) pure spectral lines (100% homogeneity, also known as Dirac
function)
d.) very high and narrow but clearly asymmetric peaks
e.) any of the above is possible; just depends on the nature of the
atoms
f.) none of the above Ans✓✓✓ b.) very high, ultra narrow, and
symmetric peaks
A powerpoint presentation is intended in a room with the brightest
screen available. Which laser pointer will be best to overcome the
screen emission intensity and guarantee the purpose of pointing?
a.) red
b.) green
c.) blue
, d.) doesn't matter - all will do the same
e.) it depends strongly on the humidity of the room Ans✓✓✓ c.) blue
a spontaneous redox/electrochemical reaction will be one that features
a.) ΔG<0 and Wel(EMF)=0
b.) ΔG<0 and Wel(EMF)>0
c.) ΔG<0 and Wel(EMF)<0
d.) ΔG=0 and Wel(EMF)=0
e.) ΔG>0 and Wel(EMF)<0 Ans✓✓✓ b.) ΔG<0 and Wel(EMF)>0
Absorption is
A) a physical process in which a gaseous or liquid compound penetrates
into the bulk of the solid
B) a chemical process in which a gaseous compound converts
specifically in a liquid on the surface of the solid
C) a physical process in which a gaseous or liquid compound forms a
layer on the surface of the solid
D) a chemical process in which a gaseous or liquid compound
undergoes redox changes on the surface of the solid
E) All of the above Ans✓✓✓ A) a physical process in which a gaseous
or liquid compound penetrates into the bulk of the solid
According to Kirchhoff's current law
