Question

Quicklime reacts vigorously with water to produce aqueous solution of ‘X’. On coming in contact with CO2, ‘X’ forms a thin layer of ‘Y’. ‘X’ and ‘Y’ respectively are Ca(OH)2 and Ca(HCO3)2, CaO and CaCO3, Ca(HCO3)2 and Ca(OH)2, Ca(OH)2 and CaCO3,

Answer 1

Answer:

Explanation:x- Ca(OH)2

y- CaCO3

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Answer 2

X given in the above sentence is is calcium hydroxide and Y is calcium carbonate

Explanation:

• Quicklime or calcium oxide dissolves in water to form calcium hydroxide. Calcium hydroxide reacts with water to form calcium carbonate. The calcium carbonate is chalky white in colour. the formation of Calcium hydroxide is by the formation of thin layer of calcium carbonate. the balanced chemical reaction of the equations that are taking place above is given below,

• CaO + H2O --------> Ca(OH)2
• Ca(OH)2 + CO2 ----------> CaCO3 + H2O

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which type of chemical reaction occurs in black and white

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