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The most efficient agent for the absorpt...

The most efficient agent for the absorption of `SO_(3)` is

A

80% `H_(2)SO_(4)`

B

98% `H_(2)SO_(4)`

C

50% `H_(2)SO_(4)`

D

20% `H_(2)S_(2)O_(7)`

Text Solution

Verified by Experts

The correct Answer is:
B
98% `H_(2)SO_(4)` is the most efficient agent for the absorption of `SO_(3)` , because acid of this strength has a lower vapour pressure. On absorption they form ‘Oleum’ `SO_(3)+H_(2)SO_(4) to H_(2)S_(2)O_(7)` (Oleum) `SO_(3)` is not directly absorbed in water, because it forms dense fog of sulphuric acid.
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