A compound 'X' is bitter to taste.It is a compound of washing powder and reacts with dilute HCl to produce brisk effervescence due to a colourless and odourless gas 'Y' which turns lime water milky due to the formation of 'Z' when an excess of CO2 is passed milkiness disappear due to the formation of 'P'. Identify 'X' 'Y' 'Z' and 'P" . write the equation in the formation of Y Z and P.

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 CaCO_3, and P is Ca(HCO₃)₂