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Occurence of Sulphuric Acid

Which gas is ...

Question

Which gas is evolved when green vitriol is heated?

A

Oxygen

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B

Ferrous

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C

Hydrogen

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D

Sulphur trioxide

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Solution

The correct option is D
Sulphur trioxide

Green vitriol gives out Sulphur trioxide.

In the early days, it was the only source of sulphuric acid.

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