Which two reactions are also redox reactions?

combustion and synthesis

synthesis and decomposition

combustion and single-replacement

single-replacement and double-replacement

The correct answer is synthesis and decomposition.

Explanation:

Redox reaction is a type of reaction where oxidation and reduction occur simultaneously.Both synthesis and decomposition belongs to the family of redox reaction.

For example

6CO2+12H2O=C6H12O6+6O2+6H2O

The above reaction is a synthesis reaction that occur during photosynthesis.It is a redox reaction because in this reaction carbon dioxide(CO2) is reduced to glucose(C6H12O6) and the water(H2O) molecule is oxidized to form oxygen(O2).

C6H12O6+6O2=6CO2+6H2O+Energy

The above reaction is a decomposition reaction that occurs during aerobic respiration.it is also a redox reaction because in this reaction glucose molecule is being oxidized to form carbon dioxide and the oxygen molecule is reduced to generate water.

i think that c)gold was found there

but i am not sure