Upon hydrolysis, which of the following carbides evolve saturated hydrocarbon gas?

C a C_{2}

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A l_{4} C_{3}

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M g_{2} C_{3}

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B e_{2} C

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Solution

The correct options are
B $A l_{4} C_{3}$
D $B e_{2} C$
Upon hydrolysis, following reactions take place.
A) $C a C_{2} + 2 H_{2} O \to C_{2} H_{2} + C a (O H)_{2}$

B) $A l_{4} C_{3} + 12 H_{2} O \to 3 C H_{4} + 4 A l (O H)_{3}$

C) $M g_{2} C_{3} + 4 H_{2} O \to C H_{3} C \equiv C H + 2 M g (O H)_{2}$

D) $B e_{2} C + 4 H_{2} O \to C H_{4} + 2 B e (O H)_{2}$

Here, saturated hydrocarbon is $C H_{4}$ which is produced by $A l_{4} C_{3}$ and $B e_{2} C$ .

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S i C, C a C_{2}, B e_{2} C, A l_{2} C_{6}, A l_{4} C_{3}, B_{4} C

Which is not obtained when metal carbides react with H₂O?

Which of the following on hydrolysis can give methane

A) $A l_{4} C_{3}$ B) $B e_{2} C$ C) Ca $C_{2}$ D) $C H_{3} M g C l$

C a C_{2}, A l_{4} C_{3} a n d M g_{2} C_{3}

H_{2} O

25^{o} C .

C a C_{2} (s) + 2 H_{2} O (l) \to C a (O H)_{2} (s) + C_{2} H_{2} (g)

A l_{4} C_{3} (s) + 12 H_{2} O (l) \to 4 A l (O H)_{3} (s) + 3 C H_{4} (g)

M g_{2} C_{3} (s) + 4 H_{2} O (l) \to 2 M g (O H)_{2} (s) + C H_{3} - C \equiv C H (g)

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