Redox Reactions in Aqueous Solutions
Chemistry ⇒ Redox Reactions and Electrochemistry
Redox Reactions in Aqueous Solutions starts at 10 and continues till grade 12.
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Assign the oxidation number to sulfur in H2SO4.
Balance the following redox reaction in acidic solution: MnO4- + Fe2+ → Mn2+ + Fe3+
Balance the following redox reaction in basic solution: ClO- → Cl- + ClO3-
Calculate the change in oxidation number of nitrogen in the reaction: NO3- → NO.
Calculate the oxidation number of chromium in Cr2O72-.
Context: In an experiment, a student mixes potassium iodide (KI) solution with chlorine water (Cl2 in H2O) and observes a color change. Question: Which element is reduced in this reaction?
Context: In an experiment, a student mixes potassium iodide (KI) solution with chlorine water (Cl2 in H2O) and observes a color change. Question: Which element is reduced in this reaction?
Context: A solution contains both Fe2+ and Fe3+ ions. When potassium permanganate (KMnO4) is added in acidic medium, a color change is observed.
Question: Explain the redox changes that occur and identify which species is oxidized and which is reduced.
Which of the following ions can act as both an oxidizing and a reducing agent in aqueous solution? (1) NO3- (2) SO42- (3) H2O2 (4) Cl-
Which of the following is a characteristic of redox reactions in aqueous solutions? (1) They always produce a gas (2) They always involve a change in oxidation number (3) They never involve water (4) They only occur with acids
Which of the following is NOT a redox reaction? (1) Zn + 2HCl → ZnCl2 + H2 (2) AgNO3 + NaCl → AgCl + NaNO3 (3) 2FeCl3 + H2S → 2FeCl2 + 2HCl + S (4) 2H2O2 → 2H2O + O2
Which of the following is the correct definition of a redox reaction? (1) A reaction in which only oxidation occurs (2) A reaction in which only reduction occurs (3) A reaction in which both oxidation and reduction occur simultaneously (4) A reaction that does not involve electron transfer
Fill in the blank: In the reaction between Fe2+ and Cr2O72- in acidic solution, Fe2+ is _______.
Fill in the blank: In the reaction between hydrogen peroxide and potassium permanganate in acidic solution, the permanganate ion is _______.
Fill in the blank: The process in which a substance gains electrons is called _______.
In the reaction: 2H2O2(aq) → 2H2O(l) + O2(g), the oxidation state of oxygen changes from _______ to _______.
State whether the following statement is true or false: In a redox reaction, the total number of electrons lost in oxidation equals the total number of electrons gained in reduction.
State whether the following statement is true or false: The sum of oxidation numbers in a polyatomic ion is equal to the charge on the ion.
True or False: In a redox reaction, the substance that loses electrons is called the reducing agent.
True or False: In aqueous solutions, the solvent (water) can participate in redox reactions.
