Answer:
(i) On releasing
the pressure, dry ice sublimes to vapour state without undergoing liquid state.
(ii) (a) Melting
point The definite temperature at which a solid starts melting is called
the melting point of that solid, e.g., melting point of ice is 0°C or 273.16
K.
(b)
Fusion The process of conversion of a solid into liquid state on heating is
called fusion or melting.
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