Spectroscopy useful for gas analysis is

Absorption spectroscopy

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Infra-red spectroscopy

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Emission spectroscopy

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Nuclear magnetic resonance spectroscopy

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Solution

The correct option is A Infra-red spectroscopy
Infrared spectroscopy involves the interaction of infrared radiation with matter. Infra-red spectroscopy can be used to identify and study chemicals. Samples may be solid, liquid, or gas. The method or technique of infrared spectroscopy is conducted with an instrument called an infrared spectrometer to produce an infrared spectrum.
Infrared (IR) spectroscopy measures the IR absorption spectrum of the measurement target gas introduced into the gas cell.
So, the correct answer is 'Infra-red spectroscopy'.

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