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a
Water vapour is absorbed by anhydrous CaCl2, but adsorbed by silica gel
b
NH3 is absorbed by water but adsorbed by charcoal
c
Sugar is decoliourised by animai charcoal based an adsorption
d
H2O is absorbed by conc H2SO4
answer is A.
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Detailed Solution
(1) CaCl2 is used in desiccator to absorb H2O. Silica gel is placed in sealed packets to adsorb moisture - Ture. (2) NH3 is dissolved in H2O but is adsorbed on charcoal - True(3) Bone charcoal is used to decolourise sugar by adsorption - True (4) H2O is absorbed by conc. H2SO4− True