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Which of these reactions are redox reactions? Check all that apply.

Cd + HCl → CdCl2 + H2

CuCl2 + Na2S → 2NaCl + CuS

CaCO3 → CaO + CO2

2ZnS + 3O2 → 2ZnO + 2SO2

CH4 + 2O2 → CO2 + 2H2O

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kenmyna

 The  reaction  that  are   redox  reaction  are

 Cd  +HCl  →  CdCl2  +H2

2 ZnS  +3 O2→ 2 ZnO  + 2  SO2

CH4  +2O2→ CO2 + 2 H2O

Explanation

A  redox  reaction is a  type of  reaction  which involve  both  reduction  and  oxidation.


Cd +HCl → CdCl2 +H2  is a redox  equation  because

 Cd is  oxidized   from  oxidation state   0 to  2+  while H  is  reduced from oxidation state  1 t o 0


All combustion reaction   are redox reaction  therefore

2 ZnS  + 3 O2 → 2ZnO + 2 SO2

    and

CH4 +2 O2 →  CO2 + 2 H2O  are  redox reaction

Reactions 1, 4 and 5 are the redox reactions.

Redox reactions are the type of chemical reaction in which the electrons are transferred from one species to another. one species gets oxidized while the other gets reduced.

How redox reactions can be explained?

In the first reaction, the cadmium is getting oxidized while the hydrogen is getting reduced.  The oxidation state of the [tex]\rm Cd[/tex] element changed from 0 to [tex]2^{+}[/tex]hydrogen changed from 1 to 0.

The fourth and the fifth reactions are the combustion reactions and thus will be redox as all the combustion reactions are reducing and oxidizing reactions.

Therefore, options 1,4 and 5 are the redox reactions.

Learn more about redox reactions here:

https://brainly.com/question/13978139

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