OXIDATION AND REDUCTION

Which statement defines oxidation?

• Gain of electron

• Gain of hydrogen

• Loss of oxygen

• Increases in oxidation number

Tags

NGSS.HS-PS1-2

The equation represents the redox reaction between ammonia and copper(II) oxide.

2 NH₃ + 3CuO -- > N₂ + 3 Cu + 3H₂O

Which of the following is true about the reaction?

• Ammonia is an oxidizing agent

• Nitrogen is a reducing agent

• Oxidation number of copper decreases from +2 to 0

• Oxidation number of hydrogen increases from -1 to +1

Tags

NGSS.HS-PS1-2

Above is an ionic equation.

Which of the following is true of the equation?

• Y²⁺ is oxidized

• X is an oxidizing agent

• X²⁺ is a reducing agent

• X donates electrons to Y²⁺

Tags

NGSS.HS-PS1-2

Which of the following is a reduction process?

• A magnesium atom loses two electrons

• Iron(II) ion converted to iron(III) ion

• copper(II) ion gains two electrons

• Hydrogen sulphide loses its hydrogen

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The following equation represents the oxidation of magnesium atom.

Mg → Mg²⁺ + 2e-

What is meant by oxidation based on the equation?

• Electrons are received by magnesium ion

• Electrons are donated by magnesium ion

• Electrons are received by magnesium atom

• Electrons are donated by magnesium atom

Tags

NGSS.HS-PS1-2

The following is the half equation of a reaction

What is meant by reduction reaction based on the equation?

• Electrons are received by chlorine

• Electrons are donated by chlorine

• Electrons are received by chloride ions

• Electrons are donated by chloride ions

Tags

NGSS.HS-PS1-2

Which of the following chemical equation, not redox reaction?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-2

What is the oxidation number of X in X₂O₃^2- ion?

• +2

• +4

• -2

• -4

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the underlined elements has the highest oxidation number?

• Fe₂(SO₄)₃

• K₂Cr₂O₇

• PbCl₄

• Cu₂O

Tags

NGSS.HS-PS1-2

The following chemical equation shows one redox reaction.

3 H₂S_(g) + 2 HNO_3(aq) → 3S_(p) + 2 NO_(g) + 4 H₂O_(l)

Which of the following oxidation number in this reaction is correct?

• Oxidation number of hydrogen change from -1 to +1

• Oxidation number of nitrogen change from +5 to +2

• Oxidation number of oxygen change from -1 to -2

• Oxidation number of sulphur change from -1 to 0

Tags

NGSS.HS-PS1-2