How many of the following carbides on reaction with water will produce a product capable of forming silver mirror, on treatment with Tollen's reagent?
$B e_{2} C, C a C_{2}, M g_{2} C_{3}, A l_{4} C_{3}, C H_{4},$

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Solution

$B e_{2} C + H_{2} O \to B e (O H)_{2} + C H_{4}$
$C a C_{2} + H_{2} O \to C a (O H)_{2} + C_{2} H_{2}$
$M g_{2} C_{3} + H_{2} O \to M g (O H)_{2} + C_{3} H_{4}$
$A l_{4} C_{3} + H_{2} O \to A l (O H)_{3} + C H_{4}$

Acetylene gives Tollen’s test but not form a silver mirror. $A g_{2} C_{2}$ is a white solid.

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Which is not obtained when metal carbides react with H₂O?

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