Deck 8: Physical Techniques in Inorganic Chemistry

Question 1

For which application is powder X-ray diffraction not suitable for?

A) phase transitions
B) chemical composition
C) sample purity

Answer 1

B

Question 2

Why does neutron diffraction require larger crystal size than single crystal X-ray diffraction?

A) Neutrons do not interact well with charged particles.
B) Neutron sources have lower flux than X-ray sources.
C) Larger sample shortens the time of the experiment.

Answer 2

B

Question 3

What type of information can be obtained from ultraviolet-visible spectroscopy?
(i) electronic structure
(ii) concentration of absorbing species
(iii) chemical composition

A) All of them
B) (ii) and (iii)
C) (i) and (ii)

Answer 3

C

Question 4

Find the correct statement on the infrared spectroscopy:

A) The samples are diluted with solid, dry KBr and pressed into a pallet.
B) Typical infrared instrument has a range between 400 and 24 cm^-1.
C) The infrared spectrometers use strong laser radiation.

Question 5

Which of the listed compounds would be best suited for the EPR analysis?

A) Group 1 halides
B) A complex containing Ti³⁺
C) Organic materials

Question 6

What is the purpose of a standard in NMR spectroscopy?

A) To set the reference point for peak intensity.
B) To help determine an unknown concentration.
C) To set the zero on the chemical shift scale.

Question 7

What is mass spectrometry used for?

A) To detect the masses of molecules and their fragments.
B) To detect the concentration of a molecular analyte in a sample.
C) To detect the structure of a molecule.

Question 8

What do atomic absorption spectroscopy, CHN analysis and X-ray fluorescence analysis have in common?

A) They are all based on absorption of radiation.
B) They are all used to analyse chemical composition.
C) They are all used in structural analysis.

Question 9

A new complex containing Cu²⁺ is prepared. Which method would you use to (i) determine bond lengths in the complex and (ii) check its chemical formula?

A) Infrared spectroscopy for (i) and mass spectroscopy for (ii).
B) Single crystal X-ray diffraction for (i) and CHN analysis for (ii).
C) EPR for (i) and thermal analysis for (ii).

Question 10

Which technique(s) do not involve use of any radiation?
(i) Mossbauer spectroscopy
(ii) cyclic voltammetry
(iii) electron paramagnetic resonance
(iv) CHN analysis

A) (ii) and (iv)
B) (i) and (iii)
C) (iii) and (iv)