Teaching Rajasthan 3rd Grade REET Mains (Level I & II) Mock Test General Science Chemistry Chemical Reaction
Which of the following is NOT an example of oxidation-reduction reaction?
1
CaCO3 → CaO + CO2
2
2Mg + O2 → 2MgO
3
ZnO + C → Zn + CO
4
2H20 → 2H2 + O2