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MCQ on UV-Visible spectroscopy: Page-10

1. Which of the following is a non-dispersive wavelength selector

(A) Gratings

(B) Prisms

(C) filters

(D) All the above

2. All of the following are useful as a source for UV-Visible, EXCEPT

(A) Globar source

(B) Xenon discharge lamp

(C) Deuterium discharge lamp

(D) Tungsten filament lamp

3. According to Woodward-Feiser rules, the base value for the following compound will be
acetophenone

(A) 213

(B) 246

(C) 230

(D) 250

The given compound is acetophenone which shows maximum absorption at 230 nm. This is the base value of this compound and any phenone with a saturated alkyl group again shows same base value.

phenones with same base value

This indicates that substitution outside the chromophore doesn’t affect absorption therefore whatever the alkyl group, all the above phenones have same base value.

Which of the following material is used to coat the cathode in photo tube

(A) Copper

(B) Sodium

(C) Bromium

(D) Cesium

Iodine is filled in the tungsten filament lamps to

(A) Increase the emission wavelength spectra

(B) Re-deposit the sublimed tungsten

(C) Decrease the decomposition of the tungsten

(D) All of the above