What is the oxidation number of carbon in CH₄?
Let C = x. H = +1. Equation: x + 4(+1) = 0, x + 4 = 0, x = -4.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
Electrode Potential and Electrochemical Series and Galvanic Cells
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Which compound contains an element with an oxidation number lower than in CO₂?
C in CO₂: +4. In CH₂O: x + 2(+1) + (-2) = 0, x = 0, which is lower.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
Which of the following reactions involves a redox process with a non-metal?
In S₈ + 8O₂ → 8SO₂, S (0) is oxidized to +4, and O (0) is reduced to -2.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
In the reaction PbS + 4H₂O₂ → PbSO₄ + 4H₂O, which element is reduced?
O (-1 in H₂O₂) becomes -2 in H₂O, gaining electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
In the reaction H₂S + Cl₂ → 2HCl + S, which element is oxidized?
Oxidation involves electron loss. S (-2 in H₂S) becomes 0 in S, losing electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
What is the oxidation number of sulfur in H₂S?
Let S = x. H = +1. Equation: 2(+1) + x = 0, 2 + x = 0, x = -2.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
In 2MnO₄− + 5C₂O₄²− + 16H+ → 2Mn²⁺ + 10CO₂ + 8H₂O, which species contains the element oxidized?
C (+3 in C₂O₄²−) to +4 in CO₂ is oxidized; Mn (+7 to +2) is reduced.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
In the reaction 2KI + Br₂ → 2KBr + I₂, which species is the reducing agent?
KI (I: -1 to 0 in I₂) loses electrons, reducing Br₂ (0 to -1).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
What is the oxidation number of osmium in OsO₄?
Let Os = x. O = -2. Equation: x + 4(-2) = 0, x - 8 = 0, x = +8.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
Which reaction demonstrates the loss of electrons by a metal?
In 2Al + 3Cl₂ → 2AlCl₃, Al (0) loses electrons to become Al₃+ (+3).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
In the reaction 3Br₂ + 6NaOH → 5NaBr + NaBrO₃ + 3H₂O, which species is the oxidizing agent?
Br₂ (0) is reduced to -1 in NaBr and oxidized to +5 in NaBrO₃, acting as its own oxidizing agent.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells
Which reaction involves the addition of oxygen to a metal?
In 4Na + O₂ → 2Na₂O, Na gains oxygen to form Na₂O, an oxidation process.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells