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Q.

In contact process , moist gases are dried using             , SO3 formed is absorbed using

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a

Conc. H2SO4 , H2O

b

Conc. H2SO4 , Conc. H2SO4

c

P2O5 ,Conc. H2SO4

d

CaO ,  H2SO4

answer is B.

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Detailed Solution

Drying agent in contact process is conc.H2SO4;It removes moisture from SO2 and O2SO3 is absorbed using conc.H2SO4  to form oleum;SO3+H2SO4conc→H2S2O7oleum ;
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