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In calcium carbide method, the gas produced is______

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in Geotechnical Engineering I by (102k points)
In calcium carbide method, the gas produced is______

(a) methane

(b) carbon dioxide

(c) acetylene

(d) oxygen

This question was posed to me in a job interview.

The doubt is from Water Content topic in section Index Properties Determination of Geotechnical Engineering I

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Correct option is (c) acetylene

To explain I would say: The acetylene gas is produced by the reaction of moisture of soil and the calcium carbide. The gas exerts pressure on a sensitive diaphragm attached to a dial gauge which reads the water content.

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