What is the oxidation number of chlorine in Cl₂O?
Let Cl = x. O = -2. Equation: 2x + (-2) = 0, 2x = 2, x = +1.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
Applications of Redox Reactions and Disproportionation
This category covers how redox reactions and disproportionation apply in chemical processes, industrial uses, and everyday phenomena. Learn to identify and solve problems involving these concepts with practical examples.
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In the reaction 2P + 3H₂O → PH₃ + H₃PO₃, what is the reducing agent?
P (0) is oxidized to +3 in H₃PO₃ and reduced to -3 in PH₃; P reduces itself in this disproportionation.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
Which of the following is not a redox reaction?
In Mg(OH)2 + 2HCl → MgCl₂ + 2H₂O, no element changes oxidation state (Mg: +2, H: +1, O: -2, Cl: -1).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
In the reaction 5H₂S + 2KMnO₄ + 3H₂SO₄ → 5S + 2MnSO₄ + K₂SO₄ + 8H₂O, which element is oxidized?
S (-2 in H₂S) becomes 0 in S, losing electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
In TeO₂ + 2H₂ → Te + 2H₂O, which species is reduced?
TeO₂ (Te: +4 to 0) gains electrons, reduced by H₂ (0 to +1).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
In which compound does oxygen have an oxidation number of +2?
In OF₂, O is less electronegative than F (-1). Equation: x + 2(-1) = 0, x = +2.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
Which of the following reactions shows the gain of electrons by a species, indicating reduction?
Reduction involves electron gain. In 2FeCl₃ + SnCl₂ → 2FeCl₂ + SnCl₄, Fe (+3) gains an electron to become Fe (+2).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
Which of the following is a redox reaction?
In CuO + H₂ → Cu + H₂O, Cu (+2 to 0) is reduced, and H (0 to +1) is oxidized.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
In the reaction 2Na + Cl₂ → 2NaCl, what is the oxidizing agent?
The oxidizing agent accepts electrons. Cl₂ (0) gains electrons to become Cl− (-1), oxidizing Na.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
Which reaction is an example of a disproportionation redox process?
In 3Br₂ + 6NaOH → 5NaBr + NaBrO₃ + 3H₂O, Br (0) is oxidized to +5 in NaBrO₃ and reduced to -1 in NaBr.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
What is the oxidation number of sulfur in H₂SO₄?
Let the oxidation number of S be x. H = +1, O = -2. Equation: 2(+1) + x + 4(-2) = 0. Solving: 2 + x - 8 = 0, x = +6.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
Which reaction involves a disproportionation process with a non-metal?
In 3S + 6NaOH → 2Na₂S + Na₂SO₃ + 3H₂O, S (0) is oxidized to +4 in Na₂SO₃ and reduced to -2 in Na₂S.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation