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Analytical Chemistry MCQs and Answers with explanation

Analytical Chemistry MCQs and Answers with explanation

1. Which of the following techniques does not involve electronmagnetic radiations





... Answer is c)
Explanation: In mass spectrometry, high energy (70 ev) beam of electrons is used to produde moleular and fragment ions. .

2. Which region of the electromagnetic spectrum is involved in the electronic excitations?





... Answer is c)
Explanation: Both of ultravoilet and visible spectroscopy are based on excitation of electrons from ground to excited state.

3. Which of the following tecniques is different from the others as regarded as the basic principle?





... Answer is d)
Explanation: Basic principle of all thsese spectronscopic technique is based on interaction of electromagnetic radiation with matter.

4. Which of the following is source of visible radiations





... Answer is a)
Explanation: Tungsten (W) is a metal. Tungsten filament lamp is used as a sources of electonic beam.

5. What is the wavelength range of the ordinary infrared region?





... Answer is b)
Explanation: Ordinary IR region ranges from 2.5 to 16 µm.

6. The position of an infrared abssoption band is commonly expressed by





... Answer is b)
Explanation: IR abrorption band are commonly expressed in wave number.

7. Which of the following is not used as a source of infrared radiations


... Answer is b)
Explanation: Tungsten filament is used as a source of IR or visible light..

8. Which region of electromagnetic spectrum is involved in mass spectrometry?





... Answer is d)
Explanation: Mass spectrometry involves the fragmentation of moleucle by high energy electons.

9. Mass spectrometry is an analytical technique which involves





... Answer is d)
Explanation: Mass spectrometry involves all of these steps.

10. Mass spectrometry can be used to determine





... Answer is a)
Explanation: Mass spectrometry is used to determine the molecular weight of compouds.

11. Which of the following species is detected in the mass spectrometer





... Answer is a)
Explanation: In mass spectrometer, only positvely charged species are detected by detector.

12. Which of the following species is produced in the ionization chamber of a mass spectrometer?





... Answer is a)
Explanation: In ionization chamber, when a beam of an electron is accelerated through strong electric feild, these electrons knock out the electrons from molecule to produe positively charged species.

13. Which kind of information about a positively charged species obtained from a mass spectrum





... Answer is c)
Explanation: From mass spectrum, we can determine the mass of molecular ion and their relative abundance in compound. Number of isotopes of an element can also be determined by this technique.

14. What kind of sample can be studied in a mass spectrometer?





... Answer is d)
Explanation: All types of compounds that exist as a gas, liquid or solid at room temperature can be studied in mass spectrometer. In mass spectrometer, sample is introduced in vapour or gaseous phase.

15. Near ultravoilet region of these electromagnetic spectrum generally lies between





... Answer is b)
Explanation: Near ultravoilet region of these electromagnetic radiation generally lies between 200-400 nm.

16. Far ultravoilet or vacuum ultravoilet region generally lies beetween





... Answer is a)
Explanation: Far ultravoilet or vacuum ultravoilet region of electromagnetic radiations generally lies beetween 10-200 nm

17. Far infrared region of the electromagnetic radiation generally lies between





... Answer is c)
Explanation: Far infrared region of the electromagnetic radiation generally lies between 50-1000 µm


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