Quiz 31 Flashcards
- In flame spectroscopy, the highest temperature fuel oxidant combination available as yet is
hydrogen-oxygen
hydrogen-nitrous oxide
acetylene-oxygen
acetylene-nitrous oxide
acetylene-oxygen
- 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
vibrational
- The nephelometric method of analysis is based upon
Beer’s law
Fajar’s law
Bouger law’s
Beer Lambert’s Law
Beer Lambert’s Law
- 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
sample holders
- Which of the following may not be used in the determination of sugars?
TLC chromatography
Polarimetry
Copper reduction methods
Lane and Eynon methods
TLC chromatography
- Which is not the recommended device for a filter photometry?
hydrogen arc lamp
glass filter
barrier layer photocell
none of these
none of these
- 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
Beer’s Law
- Deviation’s from Beer’s Law may be due to
instrumental
intermolecular reactions
formation of complexions with varying number of ligonds
all of these
all of these
- 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
all of these
- Which of the following involves emission of radiation by excited atoms:
Ultra-violet spectrophotometry
Infra-red spectrophotometry
Atomic absorption spectrometry
Nephelopmetry
Atomic absorption spectrometry
- 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
thickness of the sample cell
- 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
Flame photometry can analyze more metals than emission spectroscopy
- 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
has no light source
- Gas chromatography does not use this detector
thermal conductivity detector
refractive index detector
flame ionization detector
electron capture detector
flame ionization detector
- An aldehyde used as preservative and a germicide is
paraldehyde
benzaldehyde
acetaldehyde
formaldehyde
formaldehyde
- 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
By heating sodium acetate with soda lime
- Methane reacts with N2 in the presence of electric arc giving
methyl nitride
nitro methane
hydrocyanic acid
None is correct
hydrocyanic acid
- 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
acetylene is formed
- 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
Pyrolysis
- Methane on oxidation with ozone give
CO2 + H2
formaldehyde
methyl alcohol
methanal
methanal
- Ethylene on interaction with alk. KMnO4 (Baeyers reagent) gives
Oxalic acid
Ethyl alcohol
HCHO
Glycol
Glycol
- Dehydration of Ethylene gives a product which on hydrolysis yields
CH3OH
C2H5OH
C3H7OH
Ester
C2H5OH
- In general isomers should have the same
boiling point
number of carbon atoms
molecular mass
density
molecular mass
- Fats and oil are formed when fatty acids react with
ammonia
phenol
glycerol
acetic acid
glycerol
- It is a linear polymer which may be reversibly softened by heat and solidified by cooling.
thermosets
thermoplastic
polymer
copolymer
thermoplastic
