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What the hell is that question anyway? At which concentration? I hope this is not a serious chemistry test.
It is not asking about a solution. It only specifies carbonic acid so you can assume pure carbonic acid.
H___2CO___3
Carbonic acid reacts with water as a base to release CO2 and H2O.
So the pH of a solution of carbonic acid with water is an equilibrium of remaining dissolved CO2 and remaining acid. Which then relies on temperature and pressure.
Given that water isn’t mentioned the only correct answer is 0
??? pH is only defined in a solution of water.
But more importantly, the correct answer is 5
5 != “5”
