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tariqballe
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for the preparation of the following gases
CO2
Sulphate
Hydrogen

which element is liquid and solid in each
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TheOriginalAng
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Depends on how you want to make them.

Carbon dioxide is generally formed by the combustion of carbon in oxygen. So you start with oxygen and carbon, from there it should be easy.
Sulfates can be formed (and I think that it will be so in this case) by the combustion of sulfur in oxygen. It's similar to the case above.
In the case of hydrogen, since you ask which element is liquid and which is solid, I couldn't say. Hydrogen is an element and the only ways of acquiring it, so far as I can think, involve at least one compound.
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