Dilute hydrochloric acid reacts with marble chips to produce a gas X. When gas X is passed through limewater, a white precipitate Y is formed. Identify X and Y.

[1 mark]

X : C O_{2}; Y : C a C O_{3}

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X : C O_{2}; Y : C a {(H C O_{3})}_{2}

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X : C O; Y : C a C O_{3}

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X : C O; Y : C a {(H C O_{3})}_{2}

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Solution

The correct option is A $X : C O_{2}; Y : C a C O_{3}$
When marble chips react with dilute hydrochloric acid, carbon dioxide gas
( ${C O}_{2}$ , given here as X) is produced.

${CaCO}_{3} (s) + 2 HCl (aq) \to {CaCl}_{2} (aq) + H_{2} O (l) + {CO}_{2} (g)$

When carbon dioxide gas (X) is passed through limewater [ ${C a (O H)}_{2}$ ], the limewater turns milky, or white precipitate of calcium carbonate
( ${C a C O}_{3}$ , given here as Y) is formed.

$Ca {(OH)}_{2} (aq) + {CO}_{2} (g) \to {CaCO}_{3} (s) + H_{2} O (l)$

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Dilute hydrochloric acid reacts with marble chips to produce a gas X. When gas X is passed through limewater, a white precipitate Y is formed. Identify X and Y. [1 mark]

Dilute hydrochloric acid reacts with marble chips to produce a gas X. When gas X is passed through limewater, a white precipitate Y is formed. Identify X and Y.

[1 mark]