The most efficient agent for the absorption of SO3 is
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a
80% H2SO4
b
98% H2SO4
c
50% H2SO4
d
20% H2S2O7
answer is B.
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Detailed Solution
98% H2SO4 is used for absorbing dense fog of acid which is formed by dissolving SO3 in water. Hence 98% H2SO4 is the most efficient agent for the absorption of SO3.