A compound ‘X’ used in baking powder, was treated with HCl. A colourless
odourless gas (Y) is evolved turns lime water milky. On passing excess of gas through limewater, its milkiness disappears. Identify the compound X and the gas Y and write the reactions involved.
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Na2CO3(s) + ZHCl(aq)→ 2NaCl(aq) + H2O(l) + CO2(g) Na2CO3(s)-(X) 2NaCl(aq) - (Y) Ca(OH)2(aq) + CO2(g)→ CaCO3(s) + H2O(l) Ca(OH)2(aq)-(Lime water) CaCO3(s) + H2O(l)-(White precipitate) (Z) CaCO3(s) + H2O(l) + CO2(g)→ Ca(HCO3)2(aq) Ca(HCO3)2(aq)-(Soluble in water) (P) X→ Na2CO3(s) Y→ NaCl(aq) Z→ CaCO3(s) P→ Ca(HCO3)2(aq)
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X-BAKING SODA
Y-CARBON DIOXIDE
Explanation:
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