s-Block ElementsHard
Question
Chemical A is used for softening of water to remove temporary hardness. A reacts withsodium carbonate to produce cautic sode. When CO2 is bubbled through ′A′, it turns cloudy. Chemically ′A′, it turns cloudy. Chemically ′A′ is :
Options
A.CaO
B.CaCO3
C.Ca(HCO3)2
D.Ca(OH)2
Solution
Ca(OH)2 is used to remove temporary hardness of water.
Ca(OH)2 + Ca(HCO3)2 → 2CaCO3 ↓ + 2H2O
Ca(OH)2 + Na2CO3 → CaCO3 + 2NaOH
Ca(OH)2 + CO2 → CaCO3 + H2O
(Cloudy solution)
Ca(OH)2 + Ca(HCO3)2 → 2CaCO3 ↓ + 2H2O
Ca(OH)2 + Na2CO3 → CaCO3 + 2NaOH
Ca(OH)2 + CO2 → CaCO3 + H2O
(Cloudy solution)
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