Q. 85.0( 1 Vote )

A compound 'X' is

Answer :

It is given that the compound X is bitter to taste and it is a compound of washing powder.

i. Hence, X is sodium carbonate (Na2CO3)


ii. When Na2CO3 reacts with HCl, it gives a brisk effervescence of colourless and odourless gas, i.e., CO2 (Y)


Na2CO3 + 2HCl 2NaCl + CO2 + H2O


iii. The reaction of lime water (calcium hydroxide) with CO2 which turns lime water milky:


Ca(OH)2 + CO2 CaCO3 + H2O


iv. When an excess of CO2 is added to the limewater, milkiness disappeared due to the formation of calcium bicarbonate Ca(HCO3)2. The reaction is:


CaCO3 + CO2 + H2O Ca(HCO3)2


Thus, X is Na2CO3, Y is CO2, Z is CaCO3, and P is Ca(HCO3)2


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