खालीलपैकी कोणती अभिक्रिया तटस्थीकरण अभिक्रियेचे उदाहरण नाही?

1
H3PO4 + 3KOH → K3PO4 + 3H2O
2
CaO + H2O → Ca(OH)2
3
HNO3 + KOH → KNO3 + H2O
4
Ca(OH)2 + H2CO3 → CaCO3 + 2H2O

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