Which fo the following combination reactions is not a redox reaction ?A. ` CH_4(g) +2O_2 (g) rarr CO_2(g) +2 H_2O(l)`B. ` 3 Mg (s) + N_2 (g) rarr Mg_3N_2(s)`C. ` S(s) + O_2(g) rarr SO_2(g)`D. `CaO(s) + CO_2 (g) rarr CaCO_3(s)`

Which fo the following combination reactions is not a redox reaction ?

1.	Which fo the following combination reactions is not a redox reaction ?A. ` CH_4(g) +2O_2 (g) rarr CO_2(g) +2 H_2O(l)`B. ` 3 Mg (s) + N_2 (g) rarr Mg_3N_2(s)`C. ` S(s) + O_2(g) rarr SO_2(g)`D. `CaO(s) + CO_2 (g) rarr CaCO_3(s)`
Answer» Correct Answer - D A combination reaction may be represented by `A+ B rarr C` If either A or B or both A and B are in the elemental form, then the reaction is redox in nature. Thus, all combination reactions which involve at least one element as a reactant are redox reactions. Reaction 4 is not a redox reaction as no element is involved as a reactant, it is a combination of two compounds to form a single new compound.

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Which fo the following combination reactions is not a redox reaction ?A. ` CH_4(g) +2O_2 (g) rarr CO_2(g) +2 H_2O(l)`B. ` 3 Mg (s) + N_2 (g) rarr Mg_3N_2(s)`C. ` S(s) + O_2(g) rarr SO_2(g)`D. `CaO(s) + CO_2 (g) rarr CaCO_3(s)`

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