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Acids, Bases and Salts — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAcids, Bases and Salts1 Mark
MCQ
Carbonic acid is a dibasic acid. Why?
  • A
    Because it has two replaceable hydrogen atoms
  • B
    Because it has double electron at its valence cell
  • C
    Both (a) and (b) are correct
  • D
    None of the above
✓

Answer

(a) Because it has two replaceable hydrogen atoms
Explanation : Carbonic acid $\left( H _2 CO _3\right)$ is considered a dibasic acid because it has two replaceable hydrogen atoms (protons) in its molecule. These two hydrogen atoms can be ionized or replaced by metal ions in chemical reactions, forming two different types of acid ions: bicarbonate $\left( HCO _3{ }^{-}\right)$and carbonate $\left( CO _3^{2-}\right)$.
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