Q.

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.
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