Redox Reaction

Magnesium powder is added into copper nitrate solution to form a brown solid and a solution. Brown solid refers to ____

• copper

• magnesium

• magnesium nitrate

What is the oxidation number for iodine molecules?

• 1

• -1

• 2

• 0

What is the oxidation number for magnesium ion?

• 0

• +2

• +1

Reaction between nitric acid and sodium hydroxide is a redox reaction.

• TRUE

• FALSE

Determine the oxidation number of nitrogen ,N in KNO3

• 0

• -3

• +5

Reaction between lead nitrate and sodium sulphate produces lead sulphate and sodium nitrate. Therefore, this reaction is a redox reaction

• TRUE

• FALSE

What is the oxidation number of titanium,Ti in titanium dioxide,TiO₂ ?

• 0

• +2

• +4

Magnesium metal can react with zinc chloride to form magnesium chloride and zinc metal. Select the correct statments.

• The type of reaction is displacement reaction.

• The type of reaction is substitution reaction.

• Magnesium undergoes oxidation.

• Zinc metal undergoes reduction.

Chemical equation : Zn + CuO --> ZnO + Cu

which statements are true?

• Copper ion undergoes oxidation

• Zinc metal undergoes oxidation

• Oxidation number of zinc increases from 0 to +2

• Copper ion in CuO acts as oxidizing agent.

Half equation : Br₂ + 2e^- --> 2Br^-

Which statement is correct?

• Bromine undergoes oxidation

• Bromine undergoes reduction