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Question 1:

Atomic absorption spectrometry is a technique used to measure the absorption of which type of radiation?

A) Ultraviolet (UV) radiation
B) Visible light
C) Infrared (IR) radiation
D) X-ray radiation

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Explanation: The correct answer is B) Visible light. Atomic absorption spectrometry involves the measurement of the absorption of visible light by atoms in the gas phase. This technique is widely used for the quantitative determination of various elements in samples, including metals and metalloids.

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Question 2:

What is the principle behind atomic absorption spectrometry?

A) Scattering of light
B) Reflection of light
C) Absorption of light
D) Refraction of light

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Explanation: The correct answer is C) Absorption of light. Atomic absorption spectrometry is based on the principle that atoms in the gas phase can absorb specific wavelengths of light corresponding to their electronic transitions. By measuring the absorption of light at specific wavelengths, the concentration of an element in a sample can be determined.

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Question 3:

Which of the following is true about atomic absorption spectrometry?

A) It is used to measure the emission of light by atoms
B) It requires a spectrophotometer with only UV capabilities
C) It is limited to solid samples only
D) It provides information about the molecular structure of a sample

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Explanation: The correct answer is A) It is used to measure the emission of light by atoms. Atomic absorption spectrometry focuses on the measurement of the absorption of light by atoms. In contrast, atomic emission spectrometry measures the emission of light by excited atoms or ions. Both techniques are valuable for elemental analysis and provide complementary information.

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Question 4:

What is the instrument used to perform atomic absorption spectrometry called?

A) Spectrophotometer
B) Atomic force microscope
C) Electron microscope
D) Atomic absorption spectrometer

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Explanation: The correct answer is D) Atomic absorption spectrometer. An atomic absorption spectrometer is the instrument specifically designed to perform atomic absorption spectrometry. It typically consists of a hollow cathode lamp as the light source, a monochromator to select the desired wavelength, a sample compartment, and a detector to measure the absorption of light by the sample. The instrument's performance and accuracy are crucial in obtaining reliable results.

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Question 5:

Which of the following is a limitation of atomic absorption spectrometry?

A) It is a slow technique
B) It requires large sample volumes
C) It cannot measure elements with low atomic numbers
D) It is sensitive to sample matrix effects

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Explanation: The correct answer is D) It is sensitive to sample matrix effects. Atomic absorption spectrometry can be affected by the presence of other elements or compounds in the sample matrix, which can lead to interference and inaccurate results. Careful sample preparation and calibration are necessary to address these matrix effects. However, atomic absorption spectrometry is a fast technique, requires small sample volumes, and can measure a wide range of elements with varying atomic numbers.