(a) When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z. What are X, Y and Z?

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Solution

When dilute hydrochloric acid reacts with limestone, then calcium chloride, carbon dioxide gas (X) and water are formed.

$C a C O_{3} + 2 H C l \to C a C l_{2} + C O_{2} + H_{2} O$

Reaction of gas X with lime water

When carbon dioxide gas (X) is passed through lime water, the lime water turns milky due to the formation of a white precipitate of calcium carbonate (Y).

$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$

On passing excess of gas X through lime water

If excess carbon dioxide gas is passed through lime water, then the white precipitate formed first dissolves due to the formation of a soluble salt calcium hydrogencarbonate (Z), and the solution becomes clear again.

$C a C O_{3} + C O_{2} + H_{2} O \to C a (H C O_{3})_{2}$

Therefore, the compounds X, Y, and Z are carbon dioxide gas, calcium carbonate and calcium hydrogencarbonate respectively.

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When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water, a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z.

(a) What are X, Y and Z?

(b) Write equations for the reactions which take place:

(i) when limestone reacts with dilute HCl.

(ii) when gas X reacts with lime water to form white precipitate Y.

(iii) when excess of gas X dissolves white precipitate Y to form a soluble compound Z.

Chalk powder reacts with dilute hydrochloric acid to form a gas X which turns limewater milky due to the formation of a precipitate Y. On passing excess of gas X, the white precipitate dissolves to form a soluble compound Z.

Identify X, Y, and Z.

Q. Chalk powder reacts with dilute hydrochloric acid to formr a gas X which turns limewater milky due to the formation of a precipitate Y. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z. Identify X, Y and Z?

(a)