Question
Class 11ChemistryRedox Reactions

Balance the following equations in basic medium by both oxidation number and ion electron methods and identify the reductants and the oxidants.

(i) Cu + Au+ ⟶ Au + Cu2+

(ii) Sn(s) + NO3−(aq) + H+(aq) ⟶ Sn2+(aq) + NH4+(aq) + H2O(l)

(iii) Cu(s) + NO3−(aq) + H+(aq) ⟶ Su2+(aq) + NH4+(aq) + H2O(l)

(iv) Zn(s) + NO3−(aq) + H+(aq) ⟶ Zn2+(aq) + N2O(g) + H2O(l)

(v) Sn(aq) + NO3−(aq) + H+(aq) ⟶ SnO32−(aq) + NO2(g) + H2O(l)

(vi) As(s) + NO3−(aq) + H+(aq) ⟶ AsO43−(aq) + NO2(g) + H2O(l)

(vii) Cr2O72−(aq) + Fe2+(aq) ⟶ Cr3+(aq) + Fe3+(aq)

(viii) MnO4−(aq) + Fe2+(aq) ⟶ Mn2+(aq) + Fe3+(aq)

(ix) S + HNO3 ⟶ SO2 + NO2 + H2O

Verified Answer

(i) Cu(s) + 2Au+(aq) ⟶ 2Au(s) + Cu2+(aq)

(ii) 4Sn(s) + NO3 −(aq) + 10H+(aq) ⟶ NH4 +(aq) + 3H2O(l)

(iii) 3Cu(s) + 2NO3 −(aq) + 8H+(aq) ⟶ 3Cu2+(aq) + 2NO(g) + 4H2O(l)

(iv) 4Zn(s) + 2NO3 −(aq) + 10H+(aq) ⟶ 4Zn2+(aq) + N2O(g) + 5H2O(l)

(v) Sn(s) + 4NO3 −(aq) + 2H+(aq) ⟶ SnO3 2−(aq) + 4NO2(g) + H2O(l)

(vi) As(s) + 5NO3 −(aq) + 2H+(aq) ⟶ AsO4 3−(aq) + 5NO2(g) + H2O(l)

(vii) Cu(s) + 2NO3−(aq) + 4H+(aq) ⟶ Cu2+(aq) + 2NO2(g) + 2H2O(l)

(viii) MnO4 −(aq) + 5Fe2+(aq) + 8H+(aq) ⟶ Mn2+(aq) + 5Fe3+(aq) + 4H2O(l)

(ix) S + 4HNO3 ⟶ SO2 + 4NO2 + 2H2O