Engineering Thermodynamics
Gases have

Two values of specific heat
Under some conditions one value and sometimes two values of specific heat
No value of specific heat
Only one value of specific heat

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Engineering Thermodynamics
Mond gas is obtained by

Carbonisation of bituminous coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C

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