Redox Reactions MCQ

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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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