Answer:
(i)
At point A= Solid wax. (1/2)
At point B = Solid as well as liquid wax.
(Melting continues) (1/2)
At point C= Liquid wax (1/2)
At point D = Liquid as well as vapour state (Boiling
continues) (1 /2)
(ii) Melting point of wax = 15°C (1 /2)
(iii) Boiling point of wax = 110°C (1/2)
(iv) Straight lines in the curve parallel to Time-axis (x-axis)
indicate the change of state. These portions are to (Solid to liquid) and to
(Liquid to vapour state). (1)
(v) During melting, at melting point, the heat absorbed is
called latent heat of fusion. During boiling, at boiling point, the heat
absorbed is called latent heat of vaporisation.
(1/2+1/2)
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