Which of the following carbides on treatment with water give methane?

A l_{4} C_{3}

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B e_{2} C

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M g_{2} C_{4}

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C a C_{2}

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Solution

The correct options are
A $A l_{4} C_{3}$
D $B e_{2} C$
A) $A l_{4} C_{3} + 12 H_{2} O \to 4 A l (O H)_{3} + 3 C H_{4}$ .
B) $B e_{2} C + 4 H_{2} O \to 2 B e (O H)_{2} + C H_{4}$
C) $M g_{2} C_{4} + H_{2} O$ no reaction
D) $C a C_{2} + 2 H_{2} O \to C_{2} H_{2} + C a (O H)_{2}$
Hence option A and B are correct.

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