Q.

Which of these gases is used for heating open-hearth furnaces?

A. oil gas
B. producer gas
C. biogas
D. water gas
Answer» B. producer gas
Explanation: producer gas is known as a combination of combustible gases, carbon monoxide, and hydrogen. this gas finds its application in the heating of open-hearth furnaces, muffle furnaces, and retorts used in the production of coke. also, it can be used as a reducing means in metallurgical practices.
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