The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.(a) Name the substances (i) X (ii) Y and (iii) Z.
(b) What is the process of conversion of X into Y known as?(c) At which temperature X gets converted into Y?(d) What is the process of conversion of X into Z known as?(e) At which temperature X gets converted into Z?


(a) X, Y, and Z are water, ice and steam, respectively.
(b) The process of conversion of X (water) into Y (ice) is known as freezing.
(c) At 0°C X (water) gets converted to Y (ice).
(d) Boiling or vaporization is the process of conversion of X (water) to Z (steam).
(e) At 100°C X (water) gets converted to Z (steam). 

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Updated on: 10-Oct-2022

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