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Final Examination CHM260

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Chemistry

University

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Final Examination CHM260
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30 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In atomic spectroscopy, flame plays the most important role. State its function.

(FEB 2023)

Letting light passes through a cloud of atoms.

Supplying sufficient thermal energy to sample to dissociate ionic compounds into free

atoms

Focusing a beam of light into the atomic vapour for excitation to occur.

Providing heat in burner for evaporation to occur.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Atomization is the most critical step in AAS, and it involves three processes. Select the correct statement that explains a NEBULIZATION process.
(JAN2024)

A process to suck sample solution up the tube and into the nebulizer chamber.

Solid atoms are converted to a vapour in the flame.

The transformation of a liquid into a fine spray.

Solid atoms are mixed with the gaseous fuel.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Select the following sequence of components in the CORRECT order for atomic emission spectroscopy (AES).

(JULY 2024)

Nebulizer, Source, sample, burner, monochromator, detector, computer readout

Burner, nebulizer, monochromator, detector, computer readout

Burner, nebulizer, monochromator, computer, detector readout

Nebulizer, burner, monochromator, detector, computer readout

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In Atomic Absorption Spectroscopy (AAS), the hottest part of the flame is the best region for atomic absorption to occur. Name the region of flame.
(JAN 2024)

Primary combustion region.

Interzonal region.

Secondary combustion region.

Fuel oxidant mixture region.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Classify the type of interference involved in the analysis when two or more elements have emission spectra in adjacent or overlapping wavelengths.

(JULY 2024)

Self-absorption

Chemical Interference

Ionization Interference

Spectral Interference

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an AAS analysis of potassium, it was found that the concentration of potassium ions is

greater than the concentration of free potassium atoms. Choose the corrective technique from

the list.

(FEB 2023)

More free atoms will be formed by the atomiser.

Ions are reduced by using an ionisation suppressor.

A chemical agent is useful in providing more atoms for excitation.

Flame stability is very important in ensuring sufficient absorption occurs.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Predict which element is NOT suitable to be analysed using flame atomic absorption spectroscopy (FAAS).

(JULY 2024)

Sodium

Lead

Potassium

Uranium

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