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


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


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



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



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