HNO3 + Fe --> Fe(NO3)3 + NO + H2O

4 HNO3 + Fe --> Fe(NO3)3 + NO + 2 H2O

HNO3 + Fe --> Fe(NO3)3 + NO + H2O

HNO3 + 2Fe --> Fe(NO3)3 + NO + 2 H2O

4 HNO3 + Fe --> Fe(NO3)2 + NO + 2 H2O

NaClO + NaI + HCl --> I2 + NaCl

NaClO + 2 NaI + 2 HCl --> I2 + 2 NaCl

2NaClO + 2 NaI + 2 HCl --> I2 + 2 NaCl

2NaClO + NaI + 2 HCl --> I2 + 2 NaCl

NaClO + 2 NaI + 2 HCl --> 2I2 + NaCl

CHALLENGING!FeSO4 + KMnO4 + H2SO4 --> Fe2(SO4)3 + MnSO4 + K2SO4 + H2O

10 FeSO4 + 2 KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + 2 MnSO4 + K2SO4 + 8 H2O

5 FeSO4 + KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + MnSO4 + K2SO4 + 8 H2O

10 FeSO4 + 2 KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + 2 MnSO4 + K2SO4 + 4 H2O

FeSO4 + KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + 2 MnSO4 + K2SO4 + 8 H2O

MnO2 + O2 + KOH --> K2MnO4 + H2OThis is in basic conditions.Hint: Do not separate the MnO2 as actually it is considered covalent.

2 MnO2 + O2 + 4 KOH --> 2 K2MnO4 + 2 H2O

MnO2 + O2 + KOH --> K2MnO4 + 2 H2O

2 MnO2 + O2 + KOH --> 2 K2MnO4 + H2O

MnO2 + O2 + 4 KOH --> K2MnO4 + 2 H2O

Balancing Redox Equations

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PRactice balancing equations

Questions and Answers

1.

Li + CuSO4 --> Cu + Li2SO4
- A.
  
  3Li + 2CuSO4 --> 2Cu + 3Li2SO4
- B.
  
  Li + CuSO4 --> Cu + Li2SO4
- C.
  
  2Li + CuSO4 --> Cu + Li2SO4
- D.
  
  Li + 2CuSO4 --> 2Cu + Li2SO4
Correct Answer
C. 2Li + CuSO4 --> Cu + Li2SO4
2.

O2 + H2S --> S + H2O
- A.
  
  2O2 + 2H2S --> 2S + H2O
- B.
  
  O2 + 2H2S --> S + 2H2O
- C.
  
  2O2 + H2S --> 2S + 2H2O
- D.
  
  O2 + 2H2S --> 2S + 2H2O
Correct Answer
D. O2 + 2H2S --> 2S + 2H2O
3.

HNO₃ + Fe --> Fe(NO₃)₃ + NO + H₂O
- A.
  
  4 HNO3 + Fe --> Fe(NO3)3 + NO + 2 H2O
- B.
  
  HNO3 + Fe --> Fe(NO3)3 + NO + H2O
- C.
  
  HNO3 + 2Fe --> Fe(NO3)3 + NO + 2 H2O
- D.
  
  4 HNO3 + Fe --> Fe(NO3)2 + NO + 2 H2O
Correct Answer
A. 4 HNO3 + Fe --> Fe(NO3)3 + NO + 2 H2O
4.

NaClO + NaI + HCl --> I₂ + NaCl
- A.
  
  2NaClO + 2 NaI + 2 HCl --> I2 + 2 NaCl
- B.
  
  NaClO + 2 NaI + 2 HCl --> I2 + 2 NaCl
- C.
  
  2NaClO + NaI + 2 HCl --> I2 + 2 NaCl
- D.
  
  NaClO + 2 NaI + 2 HCl --> 2I2 + NaCl
Correct Answer
B. NaClO + 2 NaI + 2 HCl --> I2 + 2 NaCl
5.

CHALLENGING!FeSO₄ + KMnO₄ + H₂SO₄ --> Fe₂(SO₄)₃ + MnSO₄ + K₂SO₄ + H₂O
- A.
  
  5 FeSO4 + KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + MnSO4 + K2SO4 + 8 H2O
- B.
  
  10 FeSO4 + 2 KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + 2 MnSO4 + K2SO4 + 4 H2O
- C.
  
  10 FeSO4 + 2 KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + 2 MnSO4 + K2SO4 + 8 H2O
- D.
  
  FeSO4 + KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + 2 MnSO4 + K2SO4 + 8 H2O
Correct Answer
C. 10 FeSO4 + 2 KMnO4 + 8 H2SO4 --> 5 Fe2(SO4)3 + 2 MnSO4 + K2SO4 + 8 H2O
6.

MnO₂ + O₂ + KOH --> K₂MnO₄ + H₂OThis is in basic conditions.Hint: Do not separate the MnO2 as actually it is considered covalent.
- A.
  
  MnO2 + O2 + KOH --> K2MnO4 + 2 H2O
- B.
  
  2 MnO2 + O2 + KOH --> 2 K2MnO4 + H2O
- C.
  
  MnO2 + O2 + 4 KOH --> K2MnO4 + 2 H2O
- D.
  
  2 MnO2 + O2 + 4 KOH --> 2 K2MnO4 + 2 H2O
Correct Answer
D. 2 MnO2 + O2 + 4 KOH --> 2 K2MnO4 + 2 H2O

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Current Version
Mar 21, 2022

Quiz Edited by
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Mar 17, 2016

Quiz Created by
MrCanning

Balancing Redox Equations

Li + CuSO4 --> Cu + Li2SO4

O2 + H2S --> S + H2O

HNO3 + Fe --> Fe(NO3)3 + NO + H2O

NaClO + NaI + HCl --> I2 + NaCl

CHALLENGING!FeSO4 + KMnO4 + H2SO4 --> Fe2(SO4)3 + MnSO4 + K2SO4 + H2O

MnO2 + O2 + KOH --> K2MnO4 + H2OThis is in basic conditions.Hint: Do not separate the MnO2 as actually it is considered covalent.

HNO₃ + Fe --> Fe(NO₃)₃ + NO + H₂O

NaClO + NaI + HCl --> I₂ + NaCl

CHALLENGING!FeSO₄ + KMnO₄ + H₂SO₄ --> Fe₂(SO₄)₃ + MnSO₄ + K₂SO₄ + H₂O

MnO₂ + O₂ + KOH --> K₂MnO₄ + H₂OThis is in basic conditions.Hint: Do not separate the MnO2 as actually it is considered covalent.