By passing air over red hot coke the gas obtained is:

coal gas

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water gas

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oil gas

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producer gas

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Solution

The correct option is D producer gas
When air is passed over the red-hot carbonaceous fuel
$2 C + O_{2} + 3.73 N_{2} \to 2 C O + 3.73 N_{2}$
Producer gas (a mixture of carbon monoxide and nitrogen ) forms.

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