What is the chemical formula of carbonic acid?
Explanation for the correct option:
Option (A) - It is the chemical formula of carbonic acid.
Explanation for the incorrect option:
Option (B) - It is the chemical formula of acetic acid.
Option (C) - It is the chemical formula of nitric acid.
Option (D) - It is the chemical formula of nitrous acid.
Therefore, Option (A) i.e. is the correct answer.