Redox Reactions MCQ. We covered all the Redox Reactions MCQ in this post for free so that you can practice well for the exam.
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MCQ on Redox Reactions for NEET Students
In redox titration involving iodine and sodium thiosulphate, 0.03 mol of iodine liberated requires a 1.0 M sodium thiosulphate solution. Given: Molar of sodium mass thiosulphate = 158 g/mol
(A) 20 mL
(B) 30 mL
(C) 40 mL
(D) 60 mL
Option d – 60 mL
The oxidation number of carbon in graphite is ………
(A) -2
(B) 0
(C) +2
(D) +4
Option b – 0
In how many of the following, the oxidation number of the transition metal is +3? VCl3, ZnSO4, Cr2O3, ZnS, CrCl3, MnO3, V₂O5
(A) 1
(B) 2
(C) 3
(D) 4
Option c – 3
A compound ‘X’ along with bromate ion are obtained as products when permanganate ion reacts with bromide ion in a basic medium. Identify the compound ‘X’.
(A) Manganese(V) oxide
(B) Manganese(II) oxide
(C) Manganese(IV) oxide
(D) Manganese(III) oxide
Option c – Manganese(IV) oxide
The oxidation number of oxygen is positive in which of the following compounds?
(A) H₂O₂
(B) Na₂O₂
(C) OF₂
(D) KO₂
Option c – OF₂
Which of the following are arranged in increasing order of oxidation state of carbon?
(A) HCOOH, CH,O, C2H2, CH3OH
(B) CH3OH, CH₂O, HCOOH, C₂H₂
(C) CH₂O, HCOOH, CH3OH, C₂H₂
(D) CH3OH, C2H2, CH2O, HCOOH
Option d – CH3OH, C2H2, CH2O, HCOOH
The oxidation state of hydrogen in AlH3 is ……..
(A) -1
(B) 0
(C) +1
(D) +2
Option a – -1
Which of the following is NOT a redox reaction? In fact, it is a double decomposition 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 passed in an acidified K₂Cr₂O7 solution, the oxidation state of sulphur changes from ……….
(A) +4 to +6
(B) +6 to +4
(C) +4 to 0
(D) +4 to +2
Option a – +4 to +6
The oxidation number of Cr in chromyl chloride is the same as that of sulphur in ………
(A) SF4
(B) Na₂S₂O7
(C) H₂SO3
(D) H₂S4O6
Option b – Na₂S₂O7
The standard electrode potentials of four metals A, B, C, and D are -1.2 V, +0.5 V, -3.0 V, and +1.4 V respectively. The decreasing order of the electropositive character of these metals will be ……
(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
The sum of oxidation states of all the atoms in KCIO3 is ………..
(A) -6
(B) -3
(C) 0
(D) +2
Option c – 0
In the process of combustion of methane, the change in oxidation number of carbon is from …….
(A) 0 to +4
(B) -2 to +4
(C) – 4 to +4
(D) +4 to 0
Option c – – 4 to +4
The oxidation state of the metal in Mg(BrO4)2 is ……..
(A) +1
(B) +2
(C) +3
(D) +4
Option b – +2
Which of the following reactions is an example of a redox reaction?
(A) Ca(OH)2 + 2HCl -> CaCl₂ + 2H₂O
(B) BaCl₂ + MgSO4 -> BaSO4 + MgCl₂
(C) 4BCl3 + 3LiAlH4 → 2B₂H6 + 3LICI + 3AICl3
(D) NaCl + KNO3 → NaNO3 + KCI
Option c – 4BCl3 + 3LiAlH4 → 2B₂H6 + 3LICI + 3AIC13
In the process of respiration, the oxidation number of carbon changes from ……….
(A) 0 to +4
(B) +2 to +4
(C) +2 to 0
(D) 0 to +2
Option a – 0 to +4
Consider the following metal salts: P-Cupric chloride Q-Aurous chloride R-Stannic chloride S-Ferric chloride Which of the following represents the CORRECT decreasing order of the oxidation number of the central metal ion?
(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 has been arranged in decreasing order of oxidation state of nitrogen?
(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 function both as oxidizing as well as reducing agents?
(A) Cl
(B) NO3
(C) CIO
(D) MnO4
Option c – CIO
What is the oxidation number of carbon in potassium carbonate?
(A) +2
(B) +3
(C) +4
(D) +6
Option c – +4
Which of the following species does NOT show a disproportionation reaction?
(A) CIO
(B) CIO₂
(C) CIO3
(D) CIO4
Option d – CIO4
The oxidation number of phosphorus is +3 in the compound ………
(A) H₂PO₂
(B) H3PO3
(C) H3PO4
(D) H4P₂O7
Option b – H3PO3
The name of TiO₂ according to the stock notation nomenclature method is ………
(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, which element is oxidized?
(A) Hydrogen
(B) Zinc
(C) Sulphur
(D) Oxygen
Option b – Zinc
The oxidation numbers of nitrogen and sodium in NaNO₂ are respectively ………
(A) +3, +1
(B) +5, +1
(C) +1, +3
(D) -3, +1
Option a – +3, +1
The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus-containing compound. The reaction type and the oxidation states of phosphorus in phosphine and in the other product are respectively ……….
(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
Which of the following statements is CORRECT for the following reaction? H₂O + Br₂ → HOBr + HBr
(A) Bromine only gets oxidized.
(B) Bromine only gets reduced.
(C) Bromine is neither oxidized nor reduced.
(D) Bromine gets simultaneously oxidized and reduced.
Option d – Bromine gets simultaneously oxidized and reduced.
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