In the technique of flame photometry: a. Molecules of the analyte are aspirated

Question

In the technique of flame photometry:

a. Molecules of the analyte are aspirated into a flame where a small fraction of the molecules

is promoted to their excited state, from which they decay with the emission of characteristic

radiation.

b. The analyte is aspirated into a flame and promoted to the excited state by irradiation with

characteristic radiation, the absorption of which is measured.

c. The analyte is aspirated into a flame, in which it is atomised, and atoms, promoted to their

excited state, decay to the ground state with the emission of characteristic radiation.

d. A mercury analyte is subjected first to oxidation, then reduction, and the volatile elemental

mercury is vapourised in a stream of nitrogen, in which it absorbs light of a characteristic

energy.

e. A sodium, potassium or calcium analyte is subjected first to oxidation, then reduction, and

the volatile elemental analyte is vapourised in a stream of nitrogen, in which it absorbs light

of a characteristic energy.

Explanation / Answer

on the principle that an alkali metal salt drawn into a non-luminous flamewill ionise, absorb energy from the flame and then emit light of a characteristic wavelength as the excited atoms decay to the unexcited ground state. This is the basic principle of flame photometry

so the option 'a' is correct..

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