Redox reaction

What is the oxidation number of Cu in [Cu(H₂O)₆]SO₄ ?

• +1

• +2

• +4

• +6

What is the oxidation number of Pt in [PtCl₃(C₂H₄)]^- ?

• -1

• +1

• +2

• +3

Which describes an oxidation?

• An oxidizing agent gains hydrogen(s)

• An oxidizing agent gains oxygen(s)

• A reducing agent gains electron(s)

• A reducing agent increases in oxidation number

The reaction 2H₂ + O₂ -> 2H₂O is

• a neutralization

• a displacement reaction

• a redox reaction

• a combustion

What is the oxidation number of oxygen in hydrogen peroxide H₂O₂ ?

• -2

• -1

• 0

• +1

In the reaction of iron with steam, how does the oxidation number of the element in reducing agent changes?

• From 0 to +1

• From 0 to +2

• From +1 to 0

• From +2 to 0

Which is both a common oxidizing agent and reducing agent?

• Fe

• Fe²⁺

• Fe³⁺

• SO₄^2-

Which is a common reducing agent?

• SO₂ and SO₃^2-

• I^-

• Fe

• Cl₂

• MnO₄^-/H⁺

Which can be used to distinguish between silver and zinc?

• Very dilute nitric acid

• Dilute nitric acid

• Concentrated nitric acid

• Dilute sulphuric acid

• Concentrated sulphuric acid

Which of the processes forms a yellow or brown solution?

• Add KBr to chlorine water

• Add KI to chlorine water

• Add Fe to conc. HNO₃(aq)

• Add K₂SO₃ to bromine water(aq)