Which of the following is not an example...

Which of the following is not an example of redox reaction?

`CuO+H_2rarr Cu+H_2O`

`Fe_2O_3+3CO rarr 2Fe+3CO_2`

`2K+F_2rarr 2KF`

`BaCl_2 +H_2SO_4rarr BaSO_4 +2HCl`

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REDOX REACTIONS
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Which of the following is an example of redox reaction ?

`XeF_(6)+H_(2)OrarrXeO_(2)F_(2)+4Hf`

`XeF_(6)+2H_(2)OrarrXeO_(2)F_(2)+4Hf`

`XeF_(4)+O_(2)F_(2)rarrXeF_(6)+O_(2)`

`XeF_(2)+PF_(5)rarr[XeF]^(+)PF_(6)^(-)`

`XeF_(6)+H_(2)OrarrXeO_(2)F_(2)+4Hf`

`XeF_(6)+2H_(2)OrarrXeO_(2)F_(2)+4Hf`

`XeF_(4)+O_(2)F_(2)rarrXeF_(6)+O_(2)`

`XeF_(2)+PF_(5)rarr[XeF]^(+)PF_(6)^(-)`

`2NO_(2) to N_(2)O_(4)`

`NH_(4)OH to NH_(4)^(+) + OH^(-)`

`2NO_(2) + H_(2)O to HNO_(3) + HNO_(2)`

`N_(2)O_(5) +H_(2)O to 2HNO_(3)`