Answer:
Take some ammonium chloride in a China dish.
(2)
Put an inverted funnel over the China dish.
Cover the steam of funnel by a cotton plug.
Now heat the dish slowly.
Observation Ammonium chloride change its state from solid to vapours directly without going through liquid state.
(2)
Inference The change of state directly from solid to gas without changing in liquid state (or vice versa) is called sublimation. (1)
OR
(i) Boiling point of a liquid is that fixed temperature at which that liquid changes into gaseous state rapidly. (1)
(ii) Boiling point of water is 100° C or 373° K. (1)
(iii) Anhydrous calcium chloride turns wet on keeping exposed to air. (1)
(iv)(a)LPG Liquefied Petroleum Gas
(b) CNG Compressed Natural Gas (1)
(v) Since evaporation occurs only from the surface of liquid. (1)
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