1. The possible transitions for water molecule in UV-visible region are
a. σ →σ *
b. n→π *, π→π *
c. σ→σ *, n→π *
d. n → σ*
Correct Option: d
2. Choose the right statement
a. Cisoid shows less intense absorption
b. Exocyclic double bond causes a bathochromic shift of 30 n
c. The base value of transoid is 214 nm
d. Homoannular diene is called as transoid
Correct Option: c
3. The mid IR region is
a. 2.5 μm – 1mm
b. 4000-400 cm-1
c. 400-800 nm
d. 25 μm-2.5 μm
Correct Option: b
4. Which of the following is a real limitation to Beer’s law
a. Analyte Dissociation
b. Polychromatic radiation is used as source
c. Analyte at high concentrations
d. Fluorescence
Correct Option: c
5. Which of the following statement is not correct ?
a. Absorptivity changes with the intensity of the light
b. Absorbance is independent of intensity of the light
c. Absorbance has no units
d. Absorptivity is a constant and depends on the nature of the molecule
Correct Option: a
6. Dynodes are present in
a. Phototube
b. Diode array
c. Photomultiplier tube
d. Barrier layer detector
Correct Option: c
7. In phototube, photo multiplier tube, the transmitted light from the cells produces photocurrent by falling on
a. Metal junction
b. Metal layer
c. Photocathode
d. Photoanode
Correct Option: c
8. Cut off wave length is the wavelength
a. Below which a solvent absorbs too much radiation
b. Above which a solvent absorbs too much radiation
c. Below which an analyte absorbs too much radiation
d. Above which a analyte absorbs too much radiation
Correct Option: a
9. H2, CH4, C2H6 and C6H6 exhibit which PMR spectra?
a. Doublet
b. Triplet
c. Quintet
d. Singlet
Correct Option: d
10. A proton Hb is coupled to four equivalent protons Ha. The multiplicity and the relative intensity of lines in the signal Hb is?
a. Triplet, I : 4 : 6
b. Quartet, 1 : 4 : 6 : 4
c. Quintet, 1 : 4 : 6 : 4 : 1
d. Doublet, I : 4
Correct Option: c
11. In NMR spectroscopy, what is the product of Nuclear ‘g’ factor (gN), the nuclear magneton and the magnetic field strength (B0)?
a. chemical shift
b. magnetogyric ratio
c. spin-spin coupling constant
d. energy of transition from alpha to beta state
Correct Option: d
12. Standard reference in p-NMR is
a. DMS
b. TMS
c. ALL
d. PMS
Correct Option: b
13. which is more deshielded
a. CH2F2
b. CH3F
c. CH3CL
d. Both a and c
Correct Option: a
14. Which of the following organic compound with molecular formula C3H C12 exhibits only one signal in the IH NMR spectrum?
a. 1, 1-dichloropropane
b. 2, 2-dichloropropane
c. 1, 2-dichloropropane
d. 1, 3-dichloropropane
Correct Option: b
15. Which of the following has three types of hydrogens in the following compounds?
a. C6H5CH2
b. CH3– CH2 – CH(CH3) – N02
c. Br-CH = CH2
d. CH3 – CH2 – CH3
Correct Option: c
16. The distance between the centers of the peaks of doublet is called as
a. Spin-spin coupling
b. Chemical shift
c. Coupling constant
d. Spin constant
Correct Option: c
17. Which is the following technique is based on the absorption of light
a. atomic absorption
b. Uv visible
c. spectrophotometry
d. all
Correct Option: d
18. Which are the following analytical techniques is based on the emission of light
a. flame photometry
b. NMR
c. IR
d. none
Correct Option: a
19. Which of the following analytical techniques is not concerned with atomic spectroscopy?
a. atomic absorption
b. FLAME PHOTOMETRY
c. IR
d. flame emission spectroscopy
Correct Option: c
20. WHICH OF The following radiations are weakest in energy?
a. X rays
b. UV
c. visible
d. microwave
Correct Option: d
21. Which of the following color has highest energy?
a. green
b. violet
c. red
d. blue
Correct Option: d
22. IR Spectroscopy provide s information about
a. conjugation
b. functional group
c. molecular weight
d. alkyl group
Correct Option: b
23. If a molecule moves from a ground state of E1 V2 R0 TO E1 V3 R1 absorbs radiations
a. microwave
b. UV
c. VISIBLE
d. IR
Correct Option: d
24. WHICH OF THE FOLLOWING MOLECULE does not absorb in the IR region
a. H2
b. HBr
c. HCL
d. all
Correct Option: a
25. Which radiations are due to vibrational changes?
a. IR
b. visible
c. UV
d. microwave
Correct Option: a
26. A moving electric charge produces magnetic field
a. rarely
b. does not
c. some times
d. always
Correct Option: d
27. Which of the following spectroscopic region is just above the region in which we see?
a. microwave
b. laser
c. IR
d. visible
Correct Option: c
28. Electronic excitation are studied using
a. uv
b. visible
c. IR
d. both a and d
Correct Option: a
29. Which of the following is strongest?
a. microwaves
b. IR radiations
c. gamma rays
d. x-rayss
Correct Option: c
30. The light source in visible spectrophotometer is
a. deuterium discharge lamp
b. mercury lamp
c. tungsten lamp
d. hydrogen gas lamp
Correct Option: c
31. Hypochromic effect cause
a. decrease in intensity
b. shifts to shorter wave length
c. and increase in intensity
d. none
Correct Option: a
32. Single band near 3000 per centimeter is a specific band for the identification of
a. alkenes
b. alkanes
c. alcohols
d. amines
Correct Option: a
33. N to pi star transition are possible in molecules having electron
a. pi bond
b. bonding electron
c. nonbonding
d. sigma bond
Correct Option: b
34. A bonding electron disperses the poly chromatic radiation into band of monochromatic radiations
a. chopper
b. prism
c. both a,b
d. grating c
Correct Option: c
35. The polar solvent shift the………. band to longer wave length and the……. band to a shorter wave length
a. pi to pi star ,n to n star
b. pi to pi*,n to sigma*
c. pi to pi*, n to pi*
d. n to pi* ,pi to pi*
Correct Option: c
36. Which radiations are also known as inner shell radiations?
a. x-rays
b. visible
c. IR
d. microwaves
Correct Option: a
37. Maximum value of absorbance is
a. 0 to 2
b. 0 to 1
c. 0 to 0.5
d. all
Correct Option: a
38. Which cell is used in both UV and visible region?
a. quartz
b. glass
c. fused silica
d. none
Correct Option: a
39. The base value of a heteroannunular diene is
a. 300 nm
b. 217 nm
c. 253 nm
d. 214 nm
Correct Option: b
40. The increment for a single alkyl substituent is
a. 15
b. 5
c. 8
d. 10
Correct Option: b
41. Which one of the following is an auxochrome
a. NH2
b. c=o
c. C=C
d. N=N
Correct Option: a
42. WHICH SOLVENTS ARE USED IN UV- VISUBLE SPECTROSCOPy
a. ethanol c
b. n hexane
c. water
d. all
Correct Option: d
43. Benzene absorbs at
a. 204 nm
b. 254 nm
c. 184nm
d. all
Correct Option: d
44. What is the range of normal UV REGION?
a. 200 to 380 nm
b. 200 to 600 nm
c. 200 to 800 nm
d. none
Correct Option: a
45. solvents used in NMR
a. CCL4
b. WATER
c. ETHANOL
d. ALL
Correct Option: a
46. 2-Bromo propene will give how many signals in NMR
a. 4
b. 3
c. 2
d. 1
Correct Option: b
47. range of chemical shiftt in c13 NMR
a. 250ppm
b. 200ppm
c. 10ppm
d. 50ppm
Correct Option: b
48. which one gives better resolution
a. both have equal
b. chooper
c. grating
d. prism
Correct Option: c
49. how many elements are discovered by AAS
a. 62
b. 10
c. 20
d. none
Correct Option: a
50. which one is electronic spectroscopy
a. UV-visible
b. IR
c. NMR
d. None
Correct Option: a
