Chemistry
Grade-11
Easy
Question
Which of the following reactions shows the formation of hydronium ions?
- HCl (aq) → H+ (aq) + Cl- (aq)
- H2O + H+ (aq) → H3O+ (aq)
- NaOH (aq) → Na+ (aq) + OH- (aq)
- HCl + NaOH → NaCl + H2O
The correct answer is: H2O + H+ (aq) → H3O+ (aq)
A proton, H+, is highly reactive. So, in an aqueous solution, it cannot exist freely. Therefore, it combines with the oxygen atom of a water molecule (solvent) to give trigonal pyramidal hydronium ion, H3O+.
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