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Preparation of Methane from Aluminium Carbide

Which gas is ...

Question

Which gas is liberated when ${A l}_{4} C_{3}$ is hydrolysed?

A

{C H}_{4}

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B

C_{2} H_{2}

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C

C_{2} H_{6}

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D

{C O}_{2}

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Solution

The correct option is B ${C H}_{4}$
When $A l_{4} C_{3}$ undergoes hydrolysis methane ( $C H_{4}$ ) gas is produced. It can be shown by the following reaction.
$A l_{4} C_{3} + 12 H_{2} O \to 4 A l (O H)_{3} + 3 C H_{4}$

This option $A$ is the correct answer.

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2

C_{2} H_{6}

are completely burnt,

3129 k J

of heat is liberated. Calculate the heat of formation of

C_{2} H_{6}

Δ H_{f}

{C O}_{2}

H_{2} O

- 395 k J

- 286 k J

K_{p}

C_{2} H_{4} + H_{2} ⇌ C_{2} H_{6}

5 \times 10^{18} {a t m}^{- 1}

K_{p}

C_{2} H_{2} + H_{2} ⇌ C_{2} H_{4}

5 \times 10^{26} {a t m}^{- 1}

50

K_{p}

2 H_{2} + C_{2} H_{2} ⇌ C_{2} H_{6}

x \times 10^{45}

10 x

I

. The oxidation state of carbon in the compounds

{C H}_{4}, C_{2} H_{6}

C_{2} H_{2}

+ 4

.

I I

. Carbon has four valence electrons.

Q. Which gas is liberated when

A l_{4} C_{3}

is hydrolysed ?

Q. Heats of combustion of

{C H}_{4}, C_{2} H_{6}, C_{2} H_{4}

C_{2} H_{2}

- 212.8, - 373.0, - 337.0

- 310.5

k c a l

respectively at the same temperature. The best fuel among these gases is:

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