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Question

What is the basicity of oleum?

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is B 2
Basicity of acids refer to the number of H+ ions that can be released upon dissolution. In the case of oleum, which is also known as pyrosulphuric acid (H2S2O7), the basicity is 2.

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