UV-Vis Spectroscopy Quiz

Which of the following analytical method is used to measure the analyte concentration depending on the quantity of light received by the analyte?

• Spectroscopy

• Decantation

• Potentiometery

• None of the above

The λ of 𝝈 to 𝝈 * transitions lies in the

• IR region

• Visible region

• UV region

• None of the above

Select the wavelength range corresponding to UV - Visible region

• 400 - 800 nm

• 200 -800 nm

• 25μm - 2.5μm

• 2.5μm - 1mm

The possible transitions for water molecule in UV - Visible region are

• π → π*

• n → π*, π →π*

• σ → σ*, n→π*

• n → σ*

Dynodes are present in

• Barrier layer detector

• Phototube

• Photomultiplier tube

• Diode array

In phototube, PMT, the transmitted light from the cells produces photocurrent by falling on

• Photocathode

• Photoanode

• Metal junction

• Metal layer

Which molecular transitions are typically responsible for UV-Vis absorption?

• Vibrational transitions

• Rotational transitions

• Electronic transitions

• Nuclear transitions

What does the term 'chromophore' refer to in UV-Vis spectroscopy?

• A molecule with no absorbance

• The part of a molecule responsible for absorbance

• A type of detector used in spectroscopy

• The light source in a spectrophotometer

What does UV-Vis spectroscopy primarily measure?

• Mass of a molecule

• Absorption of visible light

• Absorption of ultraviolet and visible light

• Emission of ultraviolet and visible light

The photon of wavelength 400 nm corresponds to _______ wave number.

• 20000 cm -1

• 25000 cm -1

• 40000 cm -1

• None of the above