How can carbon dioxide be formed by using hydrochloric acid?

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Solution

We cannot convert hydrochloric acid into carbon dixoide but we can use hydrochloric acid to produce carbon dixoide using a metal carbonate.
The reaction of a metal carbonate with hydrochloric acid yields metal chloride with water and carbon dioxide.
HCl + calcium carbonate $\to$ calcium chloride + carbon dioxide + water.
$2 H C l (a q) + C a C O_{3} (s) \to C a C l_{2} (a q) + C O_{2} (g) + H_{2} O (l)$

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The chemical which can be used to separate a mixture of carbon powder and sulphur powder successfully is :

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