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Redox Reactions Online MCQs with Answers
Redox reactions involve the __________.
a) Transfer of electrons
b) Formation of covalent bonds
c) Dissociation of ions
d) Absorption of light
Oxidation is the __________.
a) Gain of electrons
b) Loss of electrons
c) Formation of a compound
d) Increase in oxidation state
Reduction is the __________.
a) Gain of electrons
b) Loss of electrons
c) Formation of a compound
d) Increase in oxidation state
In a redox reaction, the substance that is oxidized is called the __________.
a) Oxidizing agent
b) Reducing agent
c) Catalyst
d) Product
In a redox reaction, the substance that is reduced is called the __________.
a) Oxidizing agent
b) Reducing agent
c) Catalyst
d) Product
Which of the following represents a redox reaction?
a) 2H2O → 2H2 + O2
b) NaCl + AgNO3 → NaNO3 + AgCl
c) NH3 + HCl → NH4Cl
d) H2SO4 → H2O + SO3
Which element is undergoing reduction in the following reaction: Cl2 + 2Na → 2NaCl?
a) Chlorine (Cl)
b) Sodium (Na)
c) Oxygen (O)
d) Hydrogen (H)
Which element is undergoing oxidation in the following reaction: Cl2 + 2Na → 2NaCl?
a) Chlorine (Cl)
b) Sodium (Na)
c) Oxygen (O)
d) Hydrogen (H)
Which of the following is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) MgO + H2O → Mg(OH)2
c) CaCO3 → CaO + CO2
d) NH3 + HCl → NH4Cl
The oxidation state of an atom represents __________.
a) The number of protons in the nucleus
b) The number of neutrons in the nucleus
c) The number of electrons gained or lost
d) The mass of the atom
Which of the following represents a redox reaction?
a) 2H2O2 → 2H2O + O2
b) NaCl + KNO3 → NaNO3 + KCl
c) NH3 + H2O → NH4OH
d) CO2 + H2O → H2CO3
In the reaction: Cu + 2AgNO3 → Cu(NO3)2 + 2Ag, which species is reduced?
a) Copper (Cu)
b) Silver (Ag)
c) Nitrate (NO3)
d) Water (H2O)
In the reaction: 2Na + Cl2 → 2NaCl, which species is oxidized?
a) Sodium (Na)
b) Chlorine (Cl)
c) Sodium chloride (NaCl)
d) Water (H2O)
The substance that gains electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
The substance that loses electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
The oxidation state of an uncombined element is __________.
a) Zero
b) Positive
c) Negative
d) Equal to its atomic number
Which of the following reactions is a redox reaction?
a) HCl + NaOH → NaCl + H2O
b) CaO + CO2 → CaCO3
c) NH3 + HCl → NH4Cl
d) H2SO4 → H2O + SO3
The oxidation number of hydrogen (H) in most compounds is __________.
a) +1
b) -1
c) 0
d) It varies depending on the compound
The oxidation number of oxygen (O) in most compounds is __________.
a) +1
b) -1
c) 0
d) It varies depending on the compound
Which of the following reactions is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) CaO + H2O → Ca(OH)2
c) CH4 + 2O2 → CO2 + 2H2O
d) NH3 + HCl → NH4Cl
The species that is oxidized in the reaction: Cl2 + 2Na → 2NaCl is __________.
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
The species that is reduced in the reaction: Cl2 + 2Na → 2NaCl is __________.
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
Which of the following reactions is a redox reaction?
a) H2O2 → H2O + O2
b) NaCl + KNO3 → NaNO3 + KCl
c) NH3 + H2O → NH4OH
d) CO2 + H2O → H2CO3
The oxidation state of an atom in its elemental form is __________.
a) +1
b) -1
c) 0
d) Equal to its atomic number
In the reaction: Cu + 2AgNO3 → Cu(NO3)2 + 2Ag, which species is oxidized?
a) Copper (Cu)
b) Silver (Ag)
c) Nitrate (NO3)
d) Water (H2O)
In the reaction: Cl2 + 2Na → 2NaCl, which species is reduced?
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
Which of the following is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) MgO + H2O → Mg(OH)2
c) CaCO3 → CaO + CO2
d) NH3 + HCl → NH4Cl
The substance that loses electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
The substance that gains electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
In a redox reaction, the substance that is oxidized is called the __________.
a) Oxidizing agent
b) Reducing agent
c) Catalyst
d) Product
In a redox reaction, the substance that is reduced is called the __________.
a) Oxidizing agent
b) Reducing agent
c) Catalyst
d) Product
Which of the following represents a redox reaction?
a) 2H2O → 2H2 + O2
b) NaCl + AgNO3 → NaNO3 + AgCl
c) NH3 + HCl → NH4Cl
d) H2SO4 → H2O + SO3
Which element is undergoing reduction in the following reaction: Cl2 + 2Na → 2NaCl?
a) Chlorine (Cl)
b) Sodium (Na)
c) Oxygen (O)
d) Hydrogen (H)
Which element is undergoing oxidation in the following reaction: Cl2 + 2Na → 2NaCl?
a) Chlorine (Cl)
b) Sodium (Na)
c) Oxygen (O)
d) Hydrogen (H)
Which of the following is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) CaO + CO2 → CaCO3
c) NH3 + HCl → NH4Cl
d) H2SO4 → H2O + SO3
The oxidation state of an uncombined element is __________.
a) Zero
b) Positive
c) Negative
d) Equal to its atomic number
Which of the following reactions is a redox reaction?
a) H2O2 → H2O + O2
b) NaCl + KNO3 → NaNO3 + KCl
c) NH3 + H2O → NH4OH
d) CO2 + H2O → H2CO3
The oxidation number of hydrogen (H) in most compounds is __________.
a) +1
b) -1
c) 0
d) It varies depending on the compound
The oxidation number of oxygen (O) in most compounds is __________.
a) +1
b) -1
c) 0
d) It varies depending on the compound
Which of the following reactions is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) CaO + H2O → Ca(OH)2
c) CH4 + 2O2 → CO2 + 2H2O
d) NH3 + HCl → NH4Cl
The species that is oxidized in the reaction: Cl2 + 2Na → 2NaCl is __________.
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
The species that is reduced in the reaction: Cl2 + 2Na → 2NaCl is __________.
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
Which of the following reactions is a redox reaction?
a) H2O2 → H2O + O2
b) NaCl + KNO3 → NaNO3 + KCl
c) NH3 + H2O → NH4OH
d) CO2 + H2O → H2CO3
The oxidation state of an atom in its elemental form is __________.
a) +1
b) -1
c) 0
d) Equal to its atomic number
In the reaction: Cu + 2AgNO3 → Cu(NO3)2 + 2Ag, which species is oxidized?
a) Copper (Cu)
b) Silver (Ag)
c) Nitrate (NO3)
d) Water (H2O)
In the reaction: Cl2 + 2Na → 2NaCl, which species is reduced?
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
Which of the following is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) MgO + H2O → Mg(OH)2
c) CaCO3 → CaO + CO2
d) NH3 + HCl → NH4Cl
The substance that loses electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
The substance that gains electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
In a redox reaction, the substance that is oxidized is called the __________.
a) Oxidizing agent
b) Reducing agent
c) Catalyst
d) Product
In a redox reaction, the substance that is reduced is called the __________.
a) Oxidizing agent
b) Reducing agent
c) Catalyst
d) Product
Which of the following represents a redox reaction?
a) 2H2O → 2H2 + O2
b) NaCl + AgNO3 → NaNO3 + AgCl
c) NH3 + HCl → NH4Cl
d) H2SO4 → H2O + SO3
Which element is undergoing reduction in the following reaction: Cl2 + 2Na → 2NaCl?
a) Chlorine (Cl)
b) Sodium (Na)
c) Oxygen (O)
d) Hydrogen (H)
Which element is undergoing oxidation in the following reaction: Cl2 + 2Na → 2NaCl?
a) Chlorine (Cl)
b) Sodium (Na)
c) Oxygen (O)
d) Hydrogen (H)
Which of the following is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) CaO + CO2 → CaCO3
c) NH3 + HCl → NH4Cl
d) H2SO4 → H2O + SO3
The oxidation state of an uncombined element is __________.
a) Zero
b) Positive
c) Negative
d) Equal to its atomic number
Which of the following reactions is a redox reaction?
a) H2O2 → H2O + O2
b) NaCl + KNO3 → NaNO3 + KCl
c) NH3 + H2O → NH4OH
d) CO2 + H2O → H2CO3
The oxidation number of hydrogen (H) in most compounds is __________.
a) +1
b) -1
c) 0
d) It varies depending on the compound
The oxidation number of oxygen (O) in most compounds is __________.
a) +1
b) -1
c) 0
d) It varies depending on the compound
Which of the following reactions is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) CaO + H2O → Ca(OH)2
c) CH4 + 2O2 → CO2 + 2H2O
d) NH3 + HCl → NH4Cl
The species that is oxidized in the reaction: Cl2 + 2Na → 2NaCl is __________.
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
The species that is reduced in the reaction: Cl2 + 2Na → 2NaCl is __________.
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
Which of the following reactions is a redox reaction?
a) H2O2 → H2O + O2
b) NaCl + KNO3 → NaNO3 + KCl
c) NH3 + H2O → NH4OH
d) CO2 + H2O → H2CO3
The oxidation state of an atom in its elemental form is __________.
a) +1
b) -1
c) 0
d) Equal to its atomic number
In the reaction: Cu + 2AgNO3 → Cu(NO3)2 + 2Ag, which species is oxidized?
a) Copper (Cu)
b) Silver (Ag)
c) Nitrate (NO3)
d) Water (H2O)
In the reaction: Cl2 + 2Na → 2NaCl, which species is reduced?
a) Chlorine (Cl)
b) Sodium (Na)
c) Sodium chloride (NaCl)
d) Water (H2O)
Which of the following is a redox reaction?
a) NaCl + H2O → NaOH + HCl
b) MgO + H2O → Mg(OH)2
c) CaCO3 → CaO + CO2
d) NH3 + HCl → NH4Cl
The substance that loses electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
The substance that gains electrons in a redox reaction is __________.
a) Reduced
b) Oxidized
c) Neutralized
d) Dissociated
In a redox reaction, the substance that is oxidized is called the __________.
a) Oxidizing agent
b) Reducing agent
c) Catalyst
d) Product