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Q. Study the following graph and fill in the blanks.
image
X Y P Q
(a) Liquid$\quad$ Gas$\quad$ Freezing point$\quad$ point
(b) Boiling Melting Boiling point Melting point
(c) Fusion Vapori-sation$\quad$ Melting point Boiling point
(d) Evaporation$\quad$ Vapori-sation Fusion Boiling

Thermodynamics

Solution:

$X$ represents melting of solid into liquid and $P$ being the melting point. $Y$ represents vaporisation of liquid into gas and $Q$ represents boiling point of the liquid.