What is the oxidation number of niobium in NbCl₅?
Let Nb = x. Cl = -1. Equation: x + 5(-1) = 0, x - 5 = 0, x = +5.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
Oxidizing and Reducing Agents and Strength
This category explains how to identify oxidizing and reducing agents in redox reactions and how to compare their strength. Learn the factors that influence their reactivity and apply this knowledge to solve chemical problems.
Filter questions
What is the oxidation number of carbon in CO₂?
Let C = x. O = -2. Equation: x + 2(-2) = 0, x - 4 = 0, x = +4.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
In 2FeSO₄ + H₂O₂ + H₂SO₄ → Fe₂(SO₄)3 + 2H₂O, which species is reduced?
H₂O₂ (O: -1 to -2 in H₂O) gains electrons, oxidizing Fe (+2 to +3).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
What is the oxidation number of nitrogen in N₂H₄?
Let N = x. H = +1. Equation: 2x + 4(+1) = 0, 2x + 4 = 0, x = -2.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
In 2K₂Cr₂O₇ + 14HCl → 2CrCl₃ + 2KCl + 3Cl₂ + 7H₂O, how many electrons are transferred?
Cr (+6 in Cr₂O₇²−) to +3 in CrCl₃: 4 Cr gain 12 electrons. Cl (-1 to 0): 6 Cl lose 12 electrons. Total = 12.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
What is the oxidation number of chlorine in HClO₄?
Let Cl = x. H = +1, O = -2. Equation: +1 + x + 4(-2) = 0, 1 + x - 8 = 0, x = +7.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
What is the oxidation number of technetium in Tc₂O₇?
Let Tc = x. O = -2. Equation: 2x + 7(-2) = 0, 2x - 14 = 0, x = +7.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
Which reaction involves a redox process where a single element acts as both oxidizing and reducing agent?
In 3HNO₂ → HNO₃ + 2NO + H₂O, N (+3) in HNO₂ is oxidized to +5 in HNO₃ and reduced to +2 in NO, a disproportionation.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
Which reaction involves a redox process where the reducing agent loses electrons without gaining oxygen?
In 2Co + Br₂ → 2CoBr, Co (0 to +1) loses electrons to reduce Br (0 to -1), with no oxygen involved.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
In the reaction 2K + O₂ → K₂O₂, what is the oxidizing agent?
The oxidizing agent is reduced. O₂ (0) gains electrons to become O₂²− (-1 in peroxide), oxidizing K.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
In the reaction 3Cl₂ + 6NaOH → 5NaCl + NaClO₃ + 3H₂O, which species acts as the reducing agent?
The reducing agent is oxidized. Cl (0 in Cl₂) becomes +5 in NaClO₃ and -1 in NaCl; Cl₂ reduces itself.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
In the reaction Mg + 2HCl → MgCl₂ + H₂, what is the reducing agent?
The reducing agent donates electrons. Mg (0) loses electrons to form Mg²⁺ (+2), reducing H+.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength