Question

Complete the following reactions:Cr2O7 2- + Sn2+ + H+ ---MnO4 - + I- + OH- ---

Answer 1

Answer:

) Cr2O72– + 3Sn2++ 14H+ → 2Cr3+ + 3Sn4+ + 7H2O

(ii) MnO4– + 5Fe2– + 8H+ → 5Fe3+ + Mn2+ + 4H2O

Answer 2

Cr₂O₇⁻² + 3Sn₂⁺ + 14H⁺ --> 2Cr⁺³ + 3Sn⁺⁴ + 7H₂O

MnO₄⁻² + 5Fe⁺² + 8H⁺--> 5Fe⁺³+ Mn₂ + 4H₂O

• The above-given redox reactions can be balanced by adding H₂O molecules on the right-hand side in the acidic medium.
• The hydrogen atoms can be balanced by adding an H⁺ ion on the left-hand side in the acidic medium.
• Then balance the hydrogen atoms.

Hence, the complete reactions are

Cr₂O₇⁻² + 3Sn₂⁺ + 14H⁺ --> 2Cr⁺³ + 3Sn⁺⁴ + 7H₂O

MnO₄⁻² + 5Fe⁺² + 8H⁺--> 5Fe⁺³+ Mn₂ + 4H₂O