Question

A compound 'x' on losing partial crystallization of water gives compound 'y' which is used for making chalk and pottery artic articles. But when 'x' is strongly heated, it gives 'z' which is drying agent. Identify x, y and z and write chemical equation

Answer 1

heya....

here is ur ans...



x is hydrated Calcium carbonate
( CaCO3.2H2O)

on heating it becomes CaCO3 used to make chalk..that is y

( CaCO3+2H2O)

after that on heating it loses water molecule and forms CaO ( calcium oxide)

that is draying agent..therefore z..


hope helped

Answer 2

Answer: X- CaSO4. 2H2O (gypsum)

Y- CaSO4. 1/2H2O (plaster of paris)

Z- CaSO4

Equation: CaSO4. 2H2O = CaSO4. 1/2 H2O when heated

Explanation: