Methane is obtained from the marsh gas available from the mines of mineral coal and gas collected over petroleum in the sedimentary rocks in the crust of the earth. Methane I also present in dung, excretion of animals, gobar gas, sewage gas and biogas obtained from decomposition of plant and animal waste.
Methane gas is obtained by heating sodium acetate and soda lime.
CH3COONa + CaO + NaOH → CH4 + Na2CO3
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