Answer : The option (C) is not an oxidation-reduction reaction.
Explanation :
A : ![XeF_6(s)\righatrrow XeF_4(s)+F_2(g)](https://tex.z-dn.net/?f=XeF_6%28s%29%5Crighatrrow%20XeF_4%28s%29%2BF_2%28g%29)
This is an oxidation-reduction reaction. In this reaction, the oxidation state of 'Xe' changes from (+6) to (+4) and the oxidation state of 'F
' changes from (-1) to (0). That means 'Xe' shows reduction and 'F' shows oxidation in the reaction.
B : ![2Cs(s)+I_2(g)\righatrrow 2Csl(s)](https://tex.z-dn.net/?f=2Cs%28s%29%2BI_2%28g%29%5Crighatrrow%202Csl%28s%29)
This is an oxidation-reduction reaction. In this reaction, the oxidation state of 'Cs' changes from (0) to (+1) and the oxidation state of 'I' changes from (0) to (-1). That means 'I' shows reduction and 'Cs' shows oxidation in the reaction.
D : ![Zn(s)+2AgNo_3(aq)\rightarrow Zn(NO_3)_2(aq)+Ag(s)](https://tex.z-dn.net/?f=Zn%28s%29%2B2AgNo_3%28aq%29%5Crightarrow%20Zn%28NO_3%29_2%28aq%29%2BAg%28s%29)
This is an oxidation-reduction reaction. In this reaction, the oxidation state of 'Zn' changes from (0) to (+2) and the oxidation state of 'Ag' changes from (+1) to (0). That means 'Ag' shows reduction and 'Zn' shows oxidation in the reaction.
C : ![2H_2SO_4(aq)+2Ba(OH)_2(aq)\rightarrow 2BaSO_4(s)+4H_2O(I)](https://tex.z-dn.net/?f=2H_2SO_4%28aq%29%2B2Ba%28OH%29_2%28aq%29%5Crightarrow%202BaSO_4%28s%29%2B4H_2O%28I%29)
This is not an oxidation-reduction reaction. In this reaction, the oxidation states are not changes.
Hence, the option (C) is not an oxidation-reduction reaction.