MERIT YARD

Class 11th Chemistry - Redox Reactions - MERIT YARD

Question 1 / 40In which of the following compounds does Oxygen have an oxidation state of +2?

A) H₂O

B) H₂O₂

C) OF₂

D) KO₂

Question 2 / 40What is the oxidation number of Phosphorus in H₄P₂O₇?

A) +3

B) +5

C) +4

D) +7

Question 3 / 40A Reducing Agent (Reductant) is a substance which:

A) Accepts electrons

B) Donates electrons

C) Gains Hydrogen

D) Shows decrease in Oxidation Number

Question 4 / 40In the reaction: MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, the substance oxidised is:

A) MnO₂

B) HCl

C) MnCl₂

D) H₂O

Question 5 / 40The oxidation number of Sulfur in S₈ molecule is:

A) 0

B) +2

C) +6

D) -2

Question 6 / 40What is the oxidation number of Iron in [Fe(CN)₆]^4-?

A) +2

B) +3

C) 0

D) +6

Question 7 / 40The oxidation state of Nitrogen in NH₃ and HNO₃ are respectively:

A) +3, -5

B) -3, +5

C) +3, +5

D) -3, -5

Question 8 / 40In the reaction: H₂S + Cl₂ → 2HCl + S, Chlorine acts as:

A) Reducing Agent

B) Oxidising Agent

C) Catalyst

D) Dehydrating Agent

Question 9 / 40The oxidation state of Iodine in KIO₃ is:

A) +5

B) +7

C) -1

D) +1

Question 10 / 40A reaction in which the same substance is both oxidised and reduced is called:

A) Neutralization

B) Disproportionation

C) Decomposition

D) Displacement

Question 11 / 40What is the oxidation number of Mn in MnO₄^2- ion?

A) +7

B) +6

C) +4

D) +2

Question 12 / 40The oxidation state of Chlorine in Bleaching Powder (CaOCl₂) are:

A) +1, +1

B) +1, -1

C) -1, -1

D) 0, 0

Question 13 / 40The equivalent weight of KMnO₄ in neutral medium is:

A) M/5

B) M/3

C) M/1

D) M/2

Question 14 / 40The oxidation state of Cr in CrO₅ (Butterfly structure) is:

A) +6

B) +10

C) +5

D) +4

Question 15 / 40During the electrolysis of water, Oxidation occurs at:

A) Anode

B) Cathode

C) Both electrodes

D) None

Question 16 / 40In which of the following is the oxidation number of Oxygen -1/2?

A) Na₂O₂

B) H₂O

C) KO₂ (Superoxide)

D) BaO₂

Question 17 / 40The oxidation number of Nitrogen in Hydrazoic Acid (HN₃) is:

A) -3

B) -1/3

C) +3

D) +5

Question 18 / 40Which of the following is the strongest Reducing Agent?

A) Li

B) Na

C) K

D) Cs

Question 19 / 40The oxidation number of Carbon in Glucose (C₆H₁₂O₆) is:

A) 0

B) +4

C) -4

D) +2

Question 20 / 40Standard Hydrogen Electrode (SHE) is assigned an electrode potential of:

A) 1.0 V

B) 0.0 V

C) -0.44 V

D) 0.76 V

Question 21 / 40What is the oxidation number of Cl in HClO₄?

A) +7

B) +5

C) +1

D) -1

Question 22 / 40A salt bridge contains a paste of:

A) KCl in Agar-Agar

B) NaOH in Water

C) NaCl in Oil

D) Pure Mercury

Question 23 / 40Oxidation number of Nickel in [Ni(CO)₄] is:

A) 0

B) +2

C) +4

D) -2

Question 24 / 40In the Daniel Cell, Zinc acts as the:

A) Anode

B) Cathode

C) Electrolyte

D) Salt bridge

Question 25 / 40What is the oxidation state of Sulfur in Na₂S₂O₃ (Hypo)?

A) +4

B) +2

C) +6

D) -2

Question 26 / 40Which of the following elements never shows a positive oxidation state?

A) Fluorine

B) Chlorine

C) Oxygen

D) Nitrogen

Question 27 / 40A spontaneous redox reaction occurs in:

A) Electrolytic cell

B) Galvanic/Voltaic cell

C) Both A and B

D) None

Question 28 / 40Oxidation number of Br in BrO₃^- is:

A) +3

B) +5

C) +7

D) -1

Question 29 / 40The process of loss of Hydrogen is called:

A) Oxidation

B) Reduction

C) Hydrogenation

D) Hydration

Question 30 / 40Equivalent weight of KMnO₄ in alkaline medium is:

A) M/5

B) M/3

C) M/1

D) M/2

Question 31 / 40What is the oxidation state of Fe in Fe₃O₄?

A) +2

B) +3

C) +8/3

D) +4

Question 32 / 40The oxidation number of Xenon in XeF₄ is:

A) +4

B) +2

C) +6

D) 0

Question 33 / 40The n-factor for the reaction: Cr₂O₇^2- → 2Cr³⁺ is:

A) 3

B) 6

C) 12

D) 1

Question 34 / 40Metals are generally good ________ agents.

A) Reducing

B) Oxidising

C) Dehydrating

D) Bleaching

Question 35 / 40Oxidation number of Sulfur in Caro's Acid (H₂SO₅) is:

A) +6

B) +8

C) +4

D) +2

Question 36 / 40Which non-metal is the strongest Oxidising Agent?

A) Fluorine

B) Chlorine

C) Bromine

D) Iodine

Question 37 / 40The reaction of Iron rusting is a ________ reaction.

A) Redox

B) Only Oxidation

C) Only Reduction

D) Neutralization

Question 38 / 40In H₂C₂O₄ (Oxalic acid), Carbon has an oxidation state of:

A) +3

B) +4

C) +2

D) 0

Question 39 / 40Which of the following is a reducing agent in the extraction of metals?

A) CO

B) O₂

C) Cl₂

D) HNO₃

Question 40 / 40In an electrolytic cell, the cathode is ________ charged.

A) Positively

B) Negatively

C) Neutrally

D) Discharged

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