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Preparation and Properties of Beryllium Hydride

A substance t...

Question

A substance that reacts with water to produce marsh gas (methane) is:

C a C_{2}

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A l_{2} C_{3}

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A l_{4} C_{3}

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none of these

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Solution

The correct option is B $A l_{4} C_{3}$
Aluminium carbide( $A l_{4} C_{3}$ ) reacts with water to form the marsh gas; methane( $C H_{4}$ ). The chemical reaction can be written as;
$A l_{4} C_{3} + 12 H_{2} O \to 4 A l (O H)_{3} + 3 C H_{4}$
Aluminium carbide is compound of the group called as methanide which seems to be derived from methane and they can be used to prepare methane.

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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)

H_{2} S O_{4}

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