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helium
ozone
oxygen
methane
The gas produced in marshy places due to decomposition of vegetation is
The gas that causes suffocation and death when coal or coke is burnt in a closed room is
The gas that usually causes explosions in coal mines is
The gas used for artificial ripening of green fruit is
The gas used for cooking (LPG) is chiefly a mixture of
The gas used in the manufacture of vanaspati from vegetable oil is
The gas used in the manufacture of vegetable oil from vegetable is
The gas used to extinguish fire is
The gas which, on heating at high temperatures under high pressure, transforms into a waxy solid is
The graphite rods in the nuclear reactor