Discussion
In a gas chromatograph :
(i) FID uses an oxygen rich flame
(ii) FPD uses a hydrogen rich flame
Answer: C
The answer is (i) and (ii) both are correct.
A flame ionisation detector burns hydrogen in an excess of air, a lean, oxygen-rich flame in which organic compounds are burnt completely and form ions that are measured as a current. A flame photometric detector uses a hydrogen-rich flame, which reduces sulphur and phosphorus compounds to excited species (S2* and HPO*) that emit light at characteristic wavelengths.
Since both descriptions are accurate, the options marking either one wrong, or both, are incorrect.
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