Melodi261
Answered

Which balanced equation represents an oxidation-reduction reaction?

(1) BaCl2 + Na2SO4==>BaSO4 + 2NaCl

(2) C+H2O ==>CO + H2

(3) CaCO3==>CaO + CO2

(4) Mg(OH)2 + 2HNO3==>Mg(NO3)2 + 2H2O

Verified Answer :

lulu1991

The answer is (2). The oxidation-reduction reaction means that there is electrons transfer in the reaction. So there is valence change of at least two elements evolving in the reaction.

PBCHEM

Correct Answer: option 2 i.e. (2) C+H2O ==>CO + H2

Reason: 
Reaction is said to be oxidation-reduction (redox) type, when one species undergoes oxidation, while other species undergoes reduction. In present case, during the course of reaction, carbon is oxidized from '0' to '+2'. On other hand, hydrogen is reduced from '+1' to '0'.  

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