Question

Which of the following reactions is NOT a redox reaction? Question 25 options: SO3(g) + H2O(l)  H2SO4(aq) Al(s) + 3Ag+(aq)  Al3+(aq) + 3Ag(s) Ba(s) + Cl2(g)  BaCl2(s) H2(g) + O2(g)  H2O(g) Al(s) + Fe2O3(s)  Fe(s) + Al2O3(s)

Answer 1

The reaction SO3(g) + H2O(l) -> H2SO4(aq) is not a redox reaction.

Step-by-step explanation:

A redox reaction, or a reduction-oxidation reaction, occurs when there is a transfer of electrons between species. In a redox reaction, there must be a species that is oxidized (loses electrons) and a species that is reduced (gains electrons).

Using this definition, we can analyze the given reactions:

1. SO3(g) + H2O(l) → H2SO4(aq): This is not a redox reaction as there is no change in the oxidation state of any of the elements involved.
2. Al(s) + 3Ag+(aq) → Al3+(aq) + 3Ag(s): This is a redox reaction as Al is oxidized from 0 to +3, while Ag+ is reduced from +1 to 0.
3. Ba(s) + Cl2(g) → BaCl2(s): This is not a redox reaction as there is no change in the oxidation state of any of the elements involved.
4. H2(g) + O2(g) → H2O(g): This is not a redox reaction as there is no change in the oxidation state of any of the elements involved.
5. Al(s) + Fe2O3(s) → Fe(s) + Al2O3(s): This is a redox reaction as Al is oxidized from 0 to +3, while Fe2O3 is reduced from +3 to 0.

Therefore, the reaction that is NOT a redox reaction is:

SO3(g) + H2O(l) → H2SO4(aq)

Answer 2

SO3(g) + H2O(l) ------> H2SO4(aq)

Step-by-step explanation:

'Redox' is a term used to describe reduction and oxidation since the both are complementary processes, one can not occur without the other.

A redox reaction is one in which there is a change in the oxidation number of the reactants from left to right of the reaction equation.

If we looks at the reaction;

SO3(g) + H2O(l) ------> H2SO4(aq)

There was no change in the oxidation numbers of species from left to right of the reaction equation. For instance, the oxidation state of sulphur is +6 on both sides of the reaction equation hence it is not a redox reaction.