Which of the following is not an oxidation reduction reaction a) xef6(> xef4(s)+f2(g) b) 2cs(s)+i2(> 2csl(s) c) 2h2so4(aq)+ 2ba(oh)2(> 2baso4(s)+4h2o(i) d) zn(s)+> zn(no3)2(aq)+ag(s)

C) 2H2SO4(aq)+ 2Ba(OH)2(aq)>2BaSO4(s)+4H2O(I)

Explanation:

The reaction proper:

     2H₂SO₄ + 2Ba(OH)₂ → 2BaSO₄ + 4H₂O

The above reactions is a typical acid-base neutralization reaction.

A reaction in which oxidation-reduction did not take place is called a non-redox reaction. In such a reaction, there is no transfer of electrons between reactants, that is, none of the atoms of the reactants changes its oxidation number in forming the products.

   Most neutralization reactions are non-redox reactions.

it's filtration, but this is an assumption so my apologies if i got this

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.