Question

QUESTION 7 Which of the following is a redox reaction? HBr(aq) + KOH(aq) - H20(1) + KBr(aq) | SO3(g) + H2001) — H2504(aq) HBr(aq) + Na2S(aq) — NaBr(aq) + H2S(g) | NH4+ (aq) + 2 O2(g) — H2001) + NO3(aq) + 2 H+ (aq) Na(s) + Cl2(g) - NaCl(s) None of the above are redox reactions.

Answer 1

DUSULLABALO WA UMWAGILLOWSHULU Solution Roedox in which Reaction - Those reaching oxidation place as well as reduction takes is known as redox reaction. iis HBr + Konan > Hrocet KBr (aq) This is not a redox reaction because in this 'reaction oxidation and redexetion is not taking place of any species. There is no change in oxidation of any species. SO₂(g) + H2O se H2SO4 (99) oxidation state of sin soz i +6 oxidation state of sim H₂SO4 = +6 exygen in H2O of so, 6-2 oxgegen in Hasou = -2 so there is no change in oxidation State of any species so this is also not a redox reaction How to calculate the oxidahon state og: Sin Hasoy We know the oxidation state of some elements like H7+1 lots is a so For H₂ Soy Scanned with CamScanner which is noutral molecule 2 X(+1) + x + 4(-2) = 0 2 +X-8 = 0 => x=+6

(ii) Иgy + Na 2 S = Na Br + H2S This is also not a redox reaction because There is no change in oxidation state of any species.. ☺ NHyt + 2.O2 (g) -> M20. This is a redox reaction because i 2 420 ( reduction) do Norut 18 (oxidation) oxidation state of oxygen in O₂ = 0 oxidation state of oxygen in H2O = -2 oxidation state of the Nitrogen in Why = -3 oxidation state of Nitrogen in Noi = +5 since in equation i oxidation state of oxygen is decreasing from zero to - so this is reduction process. and in equation (ii) oxidation stake of W ig increasing from 3 to +5 so this is oxidation process. and overall reaction is a redox reaction. It means a redox reaction is made of a oxidation reaction and a recluction greaction. q Na + Cl2 2 Nach - This is also a redox reaction is Na Nat (oxidation ) Es Scanned with CamScanner (i c2 é (reduction)