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Redox Reactions
identify the substance oxidised reduced oxidisin...

Question:
Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions:

(a) 2AgBr _(s)+ C₆H₆O_2(aq) → 2Ag_(s) + 2HBr _(aq) + C₆H₄O_2(aq)

(b) HCHO_(l) + 2[Ag (NH₃)₂]⁺_(aq)+ 3OH^-_(aq) → 2Ag_(s)+ HCOO^-_(aq) + 4NH_3(aq) + 2H₂O_(l)

(c) HCHO_(l)+ 2Cu²⁺_(aq)+ 5 OH^-_(aq) → Cu₂O_(s) + HCOO^-_(aq) + 3H₂O_(l)

(d) N₂H_4(l) + 2H₂O_2(l) → N_2(g) + 4H₂O_(l)

(e) Pb_(s) + PbO_2(s) + 2H₂SO_4(aq) → 2PbSO_4(s) + 2H₂O_(l)

Answer:

a) AgBr is reduced to Ag

C₆H₆O₂ is oxidised to C₆H₄O₂

AgBr is an oxidising agent

C₆H₆O₂is a reducing agent.

b) [Ag(NH₃)⁺₂ reduced to Ag+

HCHO is oxidised to HCOO^-

[Ag(NH₃)⁺₂ is an oxidising agent.

c) HCHO is oxidised to HCOO^-

Cu²⁺ is reduced to Cu(I) state.

d) N₂H₄ is reduced to H₂O

H₂O₂ is an oxidising agent

N₂H₄ is reducing agent.

e) Pb has been oxidised to PbSO₄

PbO₂ is reduced to PbSO₄

PbO₂ is an oxidising agent

Pb is a reducing agent.

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