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Q.

Which is/are correct statement(s)?

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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
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