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mcq on Redox Reactions for NEET Students
In a redox titration between iodine and sodium thiosulphate, 0.03 moles of iodine are neutralized using a 1.0 M sodium thiosulphate solution. If the molar Mass of sodium thiosulphate is 158 g/mol, determine the volume of the solution needed.
(A) 20 mL
(B) 30 mL
(C) 40 mL
(D) 60 mL
Option d – 60 mL
What is the oxidation state of carbon in graphite?
(A) -2
(B) 0
(C) +2
(D) +4
Option b – 0
How many of these compounds contain a transition metal in the +3 oxidation state: VCl₃, ZnSO₄, Cr₂O₃, ZnS, CrCl₃, MnO₃, V₂O₅?
(A) 1
(B) 2
(C) 3
(D) 4
Option c – 3
When permanganate reacts with bromide ions in basic medium, bromate and a compound ‘X’ are formed. Identify compound ‘X’.
(A) Manganese(V) oxide
(B) Manganese(II) oxide
(C) Manganese(IV) oxide
(D) Manganese(III) oxide
Option c – Manganese(IV) oxide
In which of the following substances does oxygen exhibit a positive oxidation number?
(A) H₂O₂
(B) Na₂O₂
(C) OF₂
(D) KO₂
Option c – OF₂
Choose the SET arranged in ascending order of oxidation number of carbon.
(A) HCOOH, CH₂O, C₂H₂, CH₃OH
(B) CH₃OH, CH₂O, HCOOH, C₂H₂
(C) CH₂O, HCOOH, CH₃OH, C₂H₂
(D) CH₃OH, C₂H₂, CH₂O, HCOOH
Option d – CH₃OH, C₂H₂, CH₂O, HCOOH
Determine the oxidation number of hydrogen in aluminium hydride (AlH₃).
(A) -1
(B) 0
(C) +1
(D) +2
Option a – -1
Identify the reaction that is not a redox process but rather a double displacement reaction.
(A) Cu₂S + 2FeO → 2Cu + 2Fe + SO₂
(B) Zn + 2AgCN → 2Ag + Zn(CN)₂
(C) AgNO₃ + NaCl → AgCl + NaNO₃
(D) Zn + H₂SO₄ → ZnSO₄ + H₂
Option c – AgNO₃ + NaCl → AgCl + NaNO₃
When sulphur dioxide is bubbled through an acidified potassium dichromate solution, what is the change in the oxidation state of sulphur?
(A) +4 to +6
(B) +6 to +4
(C) +4 to 0
(D) +4 to +2
Option a – +4 to +6
The oxidation state of chromium in chromyl chloride is equal to the oxidation number of sulphur in which of the following?
(A) SF₄
(B) Na₂S₂O₇
(C) H₂SO₃
(D) H₂S₄O₆
Option b – Na₂S₂O₇
Based on standard electrode potentials, arrange the Metals A, B, C, and D (with values -1.2 V, +0.5 V, -3.0 V, and +1.4 V respectively) in decreasing order of electropositivity.
(A) D > B > C > A
(B) D > B > A > C
(C) C > A > B > D
(D) A > B > C > D
Option c – C > A > B > D
Calculate the sum of oxidation numbers of all atoms in potassium chlorate (KClO₃).
(A) -6
(B) -3
(C) 0
(D) +2
Option c – 0
In methane combustion, what is the change in carbon’s oxidation state?
(A) 0 to +4
(B) -2 to +4
(C) -4 to +4
(D) +4 to 0
Option c – -4 to +4
What is the oxidation number of the metal in magnesium perbromate, Mg(BrO₄)₂?
(A) +1
(B) +2
(C) +3
(D) +4
Option b – +2
Choose the redox reaction from the following:
(A) Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
(B) BaCl₂ + MgSO₄ → BaSO₄ + MgCl₂
(C) 4BCl₃ + 3LiAlH₄ → 2B₂H₆ + 3LiCl + 3AlCl₃
(D) NaCl + KNO₃ → NaNO₃ + KCl
Option c – 4BCl₃ + 3LiAlH₄ → 2B₂H₆ + 3LiCl + 3AlCl₃
During Respiration, what change occurs in the oxidation number of carbon?
(A) 0 to +4
(B) +2 to +4
(C) +2 to 0
(D) 0 to +2
Option a – 0 to +4
Consider the metal Salts: P – Cupric chloride, Q – Aurous chloride, R – Stannic chloride, S – Ferric chloride. Choose the correct order in decreasing oxidation number of the central metal.
(A) R > S > P > Q
(B) R > P > S > Q
(C) Q > P > S > R
(D) P > Q > S > R
Option a – R > S > P > Q
Which of the following lists nitrogen compounds in decreasing order of nitrogen’s oxidation number?
(A) NH₃ > N₂H₄ > NH₂OH > N₃H
(B) NH₂OH > N₃H > N₂H₄ > NH₃
(C) NH₃ > N₂H₄ > N₃H > NH₂OH
(D) N₃H > NH₂OH > N₂H₄ > NH₃
Option d – N₃H > NH₂OH > N₂H₄ > NH₃
Which of the following species can act as both oxidizing and reducing agents?
(A) Cl
(B) NO₃
(C) ClO
(D) MnO₄
Option c – ClO
What is the oxidation number of carbon in potassium carbonate (K₂CO₃)?
(A) +2
(B) +3
(C) +4
(D) +6
Option c – +4
Which of the following species does not undergo disproportionation?
(A) ClO
(B) ClO₂
(C) ClO₃
(D) ClO₄
Option d – ClO₄
In which compound is phosphorus present in the +3 oxidation state?
(A) H₂PO₂
(B) H₃PO₃
(C) H₃PO₄
(D) H₄P₂O₇
Option b – H₃PO₃
What is the correct name for TiO₂ using Stock notation?
(A) Titanium(II) oxide
(B) Titanium(III) oxide
(C) Titanium(IV) oxide
(D) Titanium(VI) oxide
Option c – Titanium(IV) oxide
In the reaction Zn + H₂SO₄ → ZnSO₄ + H₂, identify the element undergoing oxidation.
(A) Hydrogen
(B) Zinc
(C) Sulphur
(D) Oxygen
Option b – Zinc
Determine the oxidation states of nitrogen and sodium in sodium nitrite (NaNO₂).
(A) +3, +1
(B) +5, +1
(C) +1, +3
(D) -3, +1
Option a – +3, +1
When white phosphorus reacts with aqueous sodium hydroxide, phosphine and another phosphorus-containing compound are formed. What is the type of this reaction, and what are the oxidation states of phosphorus in the two products?
(A) Combination reaction, -3 and -5
(B) Decomposition reaction, +3 and +5
(C) Disproportionation reaction, -3 and +1
(D) Disproportionation reaction, -3 and +3
Option c – Disproportionation reaction, -3 and +1
In the reaction: H₂O + Br₂ → HOBr + HBr, which of the following statements is accurate?
(A) Bromine undergoes only oxidation
(B) Bromine undergoes only reduction
(C) Bromine remains unchanged
(D) Bromine is both oxidized and reduced
Option d – Bromine is both oxidized and reduced
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