Which of the following is laboratory preparation method of $C O_{2}$ ?

C a C O_{3} (s) + H C l (a q) \to

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C a C O_{3} (s) \to

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C H_{4} (g) + 2 O_{2} (g) Δ ⟶

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Both (a) and (c)

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Solution

The correct option is A $C a C O_{3} (s) + H C l (a q) \to$
In laboratory, $C O_{2}$ is prepared by the action of dilute HCl on $C a C O_{3}$

$C a C O_{3} (s) + H C l (a q) \to C O_{2} (g) + H_{2} O (l) + C a C l_{2} (a q)$

Reaction (b) is a industrial method. Here, the $C O_{2}$ is produces as a by-product during the manufacture of $C a O$

$C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$

In reaction (c), methane gas is highly inflammable so it is not used in laboratory for preparation of $C O_{2}$ .
Thus, option (a) is correct.

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