Methane in pure form can be obtained by using

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Sabatier and senderen’s reduction

Kolbe’s electrolysis method

Soda-lime decarboxylation reaction

Wurtz reaction

answer is C.

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Detailed Solution

Chemical formula of methane is $C H_{4} .$ The chemical name of soda lime is sodium hydroxide. When it is heated, it leads to a decarboxylation reaction in which carbon dioxide is removed from the compound.
The chemical reaction for the soda lime decarboxylation is given as follows:
$C H_{3} C O O N a + N a O H \to C H_{4} + N a_{2} C O_{3}$

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