Question

we can store carbon dioxide in which state

Answer 1

It can be stored in solid state as Dry Ice !!

Answer 2

Carbon is also found in the atmosphere where it's a part of carbon dioxide gas emitted when fossil fuels are burned and when living organisms breathe. It's in organic matter in the soil, and it's in rocks. But far and away the most carbon on Earth is stored in a surprising place: the ocean.

I hope you are satisfied to my answer so please follow me and mark me brainlist