In the reaction 2Mg + O₂ → 2MgO, which element is oxidized?
Magnesium.
In the same reaction, which element is reduced?
Oxygen.
What is the oxidation state of oxygen in most compounds?
-2.
What is the oxidation state of hydrogen in most compounds?
+1.
What is the oxidation state of a fre...
OXIDATION,REDUCTION AND ELECTROLYSIS
QUESTIONS AND ANSWERS 100%
What is oxidation in terms of electron transfer?
Loss of electrons.
What is reduction in terms of electron transfer?
Gain of electrons.
What is the term for the substance that gets reduced in a redox reaction?
Oxidizing agent.
What is the term for the substance that gets oxidized in a redox reaction?
Reducing agent.
In the reaction 2Mg + O₂ → 2MgO, which element is oxidized?
Magnesium.
In the same reaction, which element is reduced?
Oxygen.
What is the oxidation state of oxygen in most compounds?
-2.
What is the oxidation state of hydrogen in most compounds?
+1.
What is the oxidation state of a free element like O₂ or N₂?
0.
What happens to the oxidation state of an element during oxidation?
It increases.
What happens to the oxidation state of an element during reduction?
It decreases.
What is a redox reaction?
A reaction in which both oxidation and reduction occur.
In the reaction Zn + CuSO₄ → ZnSO₄ + Cu, which element is reduced?
Copper.
In the same reaction, which element is oxidized?
Zinc.
,What type of substance donates electrons in a redox reaction?
Reducing agent.
What type of substance accepts electrons in a redox reaction?
Oxidizing agent.
What is the role of oxygen in most combustion reactions?
It acts as the oxidizing agent.
How can you identify the reducing agent in a redox reaction?
It is the substance that loses electrons.
How can you identify the oxidizing agent in a redox reaction?
It is the substance that gains electrons.
What is the oxidation number of chlorine in NaCl?
-1.
What is the oxidation number of sulfur in H₂SO₄?
+6.
What is the oxidation number of nitrogen in NH₃?
-3.
What is the oxidation number of carbon in CO₂?
+4.
Why are redox reactions important in biological systems?
They are involved in processes like cellular respiration and photosynthesis.
What happens to the electrons during a redox reaction?
They are transferred from one species to another.
How does the oxidation state of an atom change in a reducing agent?
It increases.
What is the primary characteristic of a disproportionation reaction?
The same element is simultaneously oxidized and reduced.
What is an example of a disproportionation reaction?
2H₂O₂ → 2H₂O + O₂.
What is the purpose of a salt bridge in an electrochemical cell?
It maintains electrical neutrality by allowing ion flow.
, What happens at the anode of an electrochemical cell?
Oxidation.
What happens at the cathode of an electrochemical cell?
Reduction.
Which type of redox reaction occurs in batteries to generate electrical energy?
Spontaneous redox reactions.
Which describes the oxidizing agent in a chemical reaction?
the substance that is reduced because it gains electrons
Given the reaction below, which is the oxidized substance?
Mg + Cl2 Mg2+ + 2Cl
Mg
Which best identifies why the rusting of an iron nail in the presence of water and oxygen
is an oxidation-reduction reaction?
Electrons are transferred.
Which type of reaction occurs in the following?
2HgO(s) 2Hg(l) + O2(g)
a decomposition reaction in which a metal is reduced
Given the reaction below, which is the reduced substance?Mg + Cl2 Mg2+ + 2Cl
CI2
Which best describes the oxidizing agent in this reaction?
Cl2(aq) + 2Br(aq) 2Cl(aq) + Br2(aq)
Chlorine (Cl) is the oxidizing agent because it gains an electron.
Consider the following reaction. CO2(g)+H2(g)--->CO(g)+H2O(l)
What is being oxidized?
Hydrogen
What is the oxidation number for S in the compound SO3? (Recall that O has an
oxidation number of -2.)
+6
Which of the following is a simple definition of oxidation?
the loss of electrons
Which of the following is true about a redox reaction?
In a redox reaction, an electron is lost by the reducing agent.
The presence of which reactant is the best indicator of an oxidation-reduction reaction?
H2
Which answer best describes what is happening in the following reaction?
This is a redox reaction in which octane (C8H18) is oxidized.
In the reaction equation BrO-3(aq) mc020-1.jpg Br-(aq) + BrO-4(aq), how many
oxidation states does the disproportionate substance have throughout the reaction?
D
Which of these describes the oxidation number of oxygen during this reaction?
C
Which identifies an oxidation-reduction reaction?
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