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Question

What is molecular formula of oleum?
  1. H2SO3
  2. H2S2O7
  3. H2S2O8
  4. H2SO4

A
H2SO3
B
H2S2O7
C
H2S2O8
D
H2SO4
Solution
Verified by Toppr

The correct option is C H2S2O7
The molecular formula of oleum is H2S2O7.

Disulfuric acid or pyrosulfuric acid, also named oleum, is an oxyacid of sulfur. It is a major constituent of fuming sulfuric acid or oleum.

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Similar Questions
Q1
The correct sequence of decreasing number of pi-bonds in the structures of H2SO3,H2SO4 and H2S2O7 is:

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Q2
The total number of diprotic acids among the following is:

H3PO4, H2SO4, H3PO3, H2CO3, H2S2O7,H3BO3, H3PO2, H2CrO4, H2SO3

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Q3
What is molecular formula of oleum?
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Q4
Find the total number of diprotic acids among the following
H3PO4,H2SO4,H3PO3,H2CO3,H2S2O7,H3BO3,H3PO2,H2CrO4,H2SO3
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Q5
One way to express the concentration of oleum (fuming H2SO4 or H2S2O7, i.e., H2SO4+SO3) is in terms of % oleum. (100+X)% oleum means that X g H2O reacts with equivalent amount of SO3 to give oleum.

% of free SO3 in 109% oleum is:
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