CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 3

Acids, Bases and Salts 2 marks Medium

A metal compound X reacts with dilute hydrochloric acid to produce brisk effervescence. The gas evolved forms a white precipitate when passed through lime water. Write balanced chemical equations involved in the above mentioned chemical reactions.

Answer

X is a metal carbonate such as $CaCO_{3}$ ; it gives $CO_{2}$ , which turns lime water milky.

The gas turns lime water milky, so it is carbon dioxide, and X is a metal carbonate, for example calcium carbonate:

CaCO_{3} (s) + 2 HCl (a q) ⟶ CaCl_{2} (a q) + H_{2} O (l) + CO_{2} (g)

Ca(OH)_{2} (a q) + CO_{2} (g) ⟶ CaCO_{3} (s) + H_{2} O (l)

(white precipitate) Any metal carbonate or hydrogencarbonate is accepted for X; with sodium carbonate the first equation is

Na_{2} CO_{3} + 2 HCl ⟶ 2 NaCl + H_{2} O + CO_{2}

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CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 3

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