General Science Chemistry Organic Chemistry

​यापैकी कोणते विस्थापन अभिक्रियेचे उदाहरण आहे?

1
Fe(s) + CuSO4(aq) = FeSO4(aq) + Cu(s)
2
2FeSO4(s) = Fe2O3(s) + SO2(g) + SO3(g)
3
CaO(s) + H2O (1) = Ca(OH)2 (aq)
4
C(s) + O2(g) = CO2 (g)

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