Which liberate methane gas on treatment with water?

Silicon carbide

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calcium carbide

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Aluminium carbide

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Iron carbide

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Solution

The correct options are
A Silicon carbide
C Aluminium carbide
Reaction of all carbides with water,

A. $S i C + H_{2} O \to S i O_{2} + C H_{4}$

B. $C a C_{2} + H_{2} O \to C a^{+ 2} + C_{2} H_{2}$

C. $A l_{4} C_{3} + H_{2} O \to 4 A l^{+ 3} + C H_{4} (g)$

and iron carbide does not react well with water.

So the correct options are A and C.

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