Discussion

Match the undermentioned light source in List I with that of corresponding technique in List II :

List I	List II
(a) Low pressure mercury vapour lamp	(i) Near infrared
(b) High pressure xenon arc lamp	(ii) Spectrofluorimeter
(c) Nd : YAG laser	(iii) Filter fluorimeter
(d) Ordinary tungsten filament lamp	(iv) Photoluminescence
	(v) Atomic absorption

Answer: B

The correct match is a-iii, b-ii, c-iv, d-i.

A low pressure mercury vapour lamp gives a few intense lines and is the usual source of the simple filter fluorimeter.
A high pressure xenon arc lamp gives an intense continuum from the ultraviolet to the visible and is the standard source of the scanning spectrofluorimeter.
An Nd:YAG laser is used to excite photoluminescence, for example in laser detection of latent prints.
An ordinary tungsten filament lamp radiates strongly in the near infrared and is the source for that region.

Atomic absorption uses hollow cathode lamps, not any of these sources, so options using (v) are wrong.

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