Which gas is evolved when green vitriol is heated?

Oxygen

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Ferrous

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Hydrogen

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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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Hydrogen gas is evolved when Copper turnings are added to sulphuric acid.

Calcium (solid) + Water (liquid) \underset{}{\to} Calcium hydroxide (solution) + Hydrogen (gas)

Sulphur dioxide (gas) + Oxygen (gas) \underset{}{\to} Sulphur trioxide (gas)

Name the acid formed when sulphur trioxide gas reacts with water.

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