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Which fo the following combination react...

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)`

Text Solution

Verified by Experts

The correct Answer is:
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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