61. Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.
62. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
63. Pick out the wrong statement.
64. With increase in moisture content of coal, its
65. Gray King Assay and Swelling Index of a coal is a measure of its
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