Is co2 basic or acidic

Answer 1

As a gas it is neither, but can be considered as a weakly acid forming oxide.

When dissolved in water it forms a weak acid called carbonic acid:

Carbonic Acid = H2CO3

Carbon Dioxide = CO2

Answer 2

As it is a gas, it is neither acidic nor basic. but it can be considered as a weakly acid forming oxide.

It gives carbonates in a strong alkaline solution.

And when dissolved in water, it forms a weak acid- Carbonic Acid (H2CO3).