which of the follow is a redox reaction?
a.) Ba2+ (aq) + SO42- (aq) ----> BaSO4 (s)
b.) K2Cr2O7 (aq) + 2 KOH (aq) ----> 2 K2CrO4 (aq) + H2O (l)
c.) Na2CO3 (s) + 2 HCl (aq) ----> 2 NaCl (aq) + CO2 (g) + H2O (l)
d.) 2 Na (g) + Cl2 (g) ----> 2 NaCl (s)
e.) H2O (l) ----> H+ (aq) + OH- (aq)
I know the answer is "d" however I do not know why. Can you please explain why "d" is correct and what the other types of reactions are? Thank you very much!
Redox is a reaction where oxidation and reduction both takes place simultaneously. In reaction d
2Na(g) + Cl2(g) --2NaCl (s)
We see oxidation state of both Na and Cl in reactant side is 0 as they both are in their elemantal state and when we go to product side we see sodium Na has oxidation of +1 and chlorine Cl has oxidation state of -1
So there is oxidation of Na and reduction of Cl in a same recatior so this is called a redox reaction.
While other reaction are simply formation reaction (1 , 5 ) 2nd is displacement reaction. Etc
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