Which of the following reactions is/are redox reactions? You may select more tha

Question

Which of the following reactions is/are redox reactions?  You may select more than one reaction.

Na2CrO4(aq) + 2HCl(aq) = H2CrO4(aq) + 2NaCl(aq)

(NH4)2S(aq) + CuSO4(aq) = (NH4)2SO4(aq) + CuS(s)

Pb(NO3)2(aq) + Na2S(aq) = PbS(s) + 2NaNO3(aq)

C(s, graphite) = C(s, diamond)

P4(s, white) + 5O2(g) = P4O10(s)

FeSO4(aq) + H2O2(aq) = OH- + OH• + Fe3+(aq) + SO42- (aq)

Na2CrO4(aq) + 2HCl(aq) = H2CrO4(aq) + 2NaCl(aq)

(NH4)2S(aq) + CuSO4(aq) = (NH4)2SO4(aq) + CuS(s)

Pb(NO3)2(aq) + Na2S(aq) = PbS(s) + 2NaNO3(aq)

C(s, graphite) = C(s, diamond)

P4(s, white) + 5O2(g) = P4O10(s)

FeSO4(aq) + H2O2(aq) = OH- + OH• + Fe3+(aq) + SO42- (aq)

Explanation / Answer

answer : redox reaction

FeSO4(aq) + H2O2(aq) ------------------->   OH- + OH• + Fe3+(aq) + SO42- (aq)

explanation :

in this reaction :

oxidation: Fe---------------------> Fe+3 + e

reduction :   O- + e- -----------------------> O-2

in H2O2   oxidation state = -1 but in product in OH- oxygen oxidation state = -2

so reduction takes place.

both oxidation and reduction takes place in one reaction known to be redox reaction

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