General Science Chemistry Chemical Reaction

ಕೆಳಗಿನ ಯಾವ ಕ್ರಿಯೆಗಳು ಉತ್ಕರ್ಷಣ-ಅಪಕರ್ಷಣ ಕ್ರಿಯೆಯಲ್ಲ?

1
CH4 + 2O2 → CO2 + 2H2O
2
Fe2O3 + 3C → 2Fe + 3CO
3
3CuO + 2NH3 → 3Cu + N2 + 3H2O
4
Ca(OH)2 + 2CH3COOH → Ca(CH3COO)2 + 2H2O

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