Quiz 31

Question 1

1. In flame spectroscopy, the highest temperature fuel oxidant combination available as yet is

hydrogen-oxygen

hydrogen-nitrous oxide

acetylene-oxygen

acetylene-nitrous oxide

Answer 1

acetylene-oxygen

Question 2

2. If the change in a molecule caused by absorption of light energy involves change in the average separation of the nuclei of two or more atoms, then the change is

electronic

vibrational

translational

rotational

Answer 2

vibrational

Question 3

3. The nephelometric method of analysis is based upon

Beer’s law

Fajar’s law

Bouger law’s

Beer Lambert’s Law

Answer 3

Beer Lambert’s Law

Question 4

4. IR spectro-photometers have practically the same basic components as visible and UV spectro-photometers. In which of the following basic components could the devices be used interchangeable in both:

sources of radiant energy

optical system

sample holders

detectors

Answer 4

sample holders

Question 5

5. Which of the following may not be used in the determination of sugars?

TLC chromatography

Polarimetry

Copper reduction methods

Lane and Eynon methods

Answer 5

TLC chromatography

Question 6

6. Which is not the recommended device for a filter photometry?

hydrogen arc lamp

glass filter

barrier layer photocell

none of these

Answer 6

none of these

Question 7

7. This law states that the amount of light absorbed or transmitted by a solution is an experimental function of the concentration of absorbing substance present and the sample path length

Bouger’s Law

Beer’s Law

Lambert’s Law

Bouger-Beer Law

Answer 7

Beer’s Law

Question 8

8. Deviation’s from Beer’s Law may be due to

instrumental

intermolecular reactions

formation of complexions with varying number of ligonds

all of these

Answer 8

all of these

Question 9

9. IR spectrophotometers have the same basic components as UV spectrophotometers, except:

source of radiant energy and the kind of detectors

materials used in the optical system

materials used in the sample cells

all of these

Answer 9

all of these

Question 10

10. Which of the following involves emission of radiation by excited atoms:

Ultra-violet spectrophotometry

Infra-red spectrophotometry

Atomic absorption spectrometry

Nephelopmetry

Answer 10

Atomic absorption spectrometry

Question 11

11. The absorption of a solution of a particular substance does not depend on the :

wavelength of the incident light

intensity of the incident light

concentration of the substance

thickness of the sample cell

Answer 11

thickness of the sample cell

Question 12

12. If we compare flame spectrophotometry and emission spectroscopy, which of the following statements will be true?

Flame photometry is more senstive than emission spectroscopy

Flame photometry can analyze more metals than emission spectroscopy

Flame photometry is less sensitive to the matrix than emission spectroscopy

Flame photometry is simpler to use than emission spectroscopy

Answer 12

Flame photometry can analyze more metals than emission spectroscopy

Question 13

13. Atomic absorption spectrophotometry (AAS) differs from visible absorption spectrophotometry because AAS

has no light source

does not need a monochromator

does not follow Beer’s Law

destroys the sample when a reading is made

Answer 13

has no light source

Question 14

14. Gas chromatography does not use this detector

thermal conductivity detector

refractive index detector

flame ionization detector

electron capture detector

Answer 14

flame ionization detector

Question 15

15. An aldehyde used as preservative and a germicide is

paraldehyde

benzaldehyde

acetaldehyde

formaldehyde

Answer 15

formaldehyde

Question 16

16. Which one of the following method is used in the preparation of methane?

By the electrolysis of aluminum carbide

By heating aluminum carbide

By heating sodium acetate with soda lime

By the interaction of sodium acetate with water

Answer 16

By heating sodium acetate with soda lime

Question 17

17. Methane reacts with N2 in the presence of electric arc giving

methyl nitride

nitro methane

hydrocyanic acid

None is correct

Answer 17

hydrocyanic acid

Question 18

18. What happens when methane is passed through electric arc or subjected to high temperature obtained by partial combustion?

acetylene and ethane are formed

carbon and hydrogen are formed

CH2 and H2 is formed

acetylene is formed

Answer 18

acetylene is formed

Question 19

19. When methane is heated in the absence of air or O2 it break up to give Carbon and Hydrogen. The process is named as

Cracking

Polymerization

Pyrolysis

Decomposition

Answer 19

Pyrolysis

Question 20

20. Methane on oxidation with ozone give

CO2 + H2

formaldehyde

methyl alcohol

methanal

Answer 20

methanal

Question 21

21. Ethylene on interaction with alk. KMnO4 (Baeyers reagent) gives

Oxalic acid

Ethyl alcohol

HCHO

Glycol

Answer 21

Glycol

Question 22

22. Dehydration of Ethylene gives a product which on hydrolysis yields

CH3OH

C2H5OH

C3H7OH

Ester

Answer 22

C2H5OH

Question 23

23. In general isomers should have the same

boiling point

number of carbon atoms

molecular mass

density

Answer 23

molecular mass

Question 24

24. Fats and oil are formed when fatty acids react with

ammonia

phenol

glycerol

acetic acid

Answer 24

glycerol

Question 25

25. It is a linear polymer which may be reversibly softened by heat and solidified by cooling. thermosets thermoplastic polymer copolymer

Answer 25

thermoplastic