Oxidation and Reduction
Chemistry ⇒ Redox Reactions and Electrochemistry
Oxidation and Reduction starts at 10 and continues till grade 12.
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See sample questions for grade 10
Assign the oxidation number of sulfur in H2SO4.
Balance the following redox reaction in acidic medium: Fe2+ + Cr2O72- → Fe3+ + Cr3+
Explain what is meant by the term 'oxidation number'.
Explain why the reaction between hydrogen and fluorine to form hydrogen fluoride is a redox reaction.
Explain why the reaction: Zn + 2HCl → ZnCl2 + H2 is a redox reaction.
Identify the oxidizing agent in the following reaction: 2H2 + O2 → 2H2O.
In the context of redox reactions, what does the acronym OIL RIG stand for?
In the reaction: 2Fe3+ + 2I- → 2Fe2+ + I2, which species is oxidized?
Which of the following best defines oxidation? (1) Gain of electrons (2) Loss of electrons (3) Gain of protons (4) Loss of neutrons
Which of the following is a disproportionation reaction? (1) 2H2 + O2 → 2H2O (2) 2H2O2 → 2H2O + O2 (3) Zn + CuSO4 → ZnSO4 + Cu (4) NaOH + HCl → NaCl + H2O
Which of the following is a redox reaction? (1) CaCO3 → CaO + CO2 (2) 2K + Br2 → 2KBr (3) NaOH + HCl → NaCl + H2O (4) AgNO3 + NaCl → AgCl + NaNO3
Which of the following is a redox reaction? (1) H2SO4 + NaOH → Na2SO4 + H2O (2) 2Na + Cl2 → 2NaCl (3) AgNO3 + NaCl → AgCl + NaNO3 (4) BaCl2 + Na2SO4 → BaSO4 + 2NaCl
Reduction is the process in which a substance ______ electrons.
The oxidation number of hydrogen in most compounds is ______.
The oxidation number of oxygen in most compounds is ______.
The process of losing hydrogen is called ______.
State whether the following statement is true or false: All decomposition reactions are redox reactions.
State whether the following statement is true or false: The oxidation number of an element in its free state is always zero.
True or False: In a redox reaction, oxidation and reduction always occur simultaneously.
True or False: In a redox reaction, the oxidizing agent is reduced.
