JEE Main PYQs — Redox Reactions

0.1 M solution of KI reacts with excess of H2SO4 and KIO3 solution. According to equation 5I- + IO3- + 6H+ -> 3I2 + 3H2O Identify the correct statements: (A) 200 mL of KI solution reacts with 0.004…

Match the List-I with List-II | | List-I (Redox Reaction) | | List-II (Type) | |---|---|---|---| | A | CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l) | I | Disproportionation | | B | 2Na(s) ->[] 2Na(s) + H2(g)…

Which of the following oxidation reactions are carried out by both K2Cr2O7 and KMnO4 in acidic medium? (A) I- -> I2 (B) S2- -> S (C) Fe2+ -> Fe3+ (D) I- -> IO3- (E) S2O32- -> SO42- Choose the correct…

Match List-I with List-II. | List-I (Reaction) | List-II (Type) | |---|---| | (A) N2(g) + O2(g) 2NO(g) | (I) Decomposition | | (B) 2Pb(NO3)2(s) 2PbO(s) + 4NO2(g) + O2(g) | (II) Displacement | | (C)…

Thiosulphate reacts differently with iodine and bromine in the reactions given below: 2S2O32- + I2 S4O62- + 2I- S2O32- + 5Br2 + 5H2O 2SO42- + 4Br- + 10H+ Which of the following statement justifies…

Which of the following cannot function as an oxidising agent?

Among the following halogens F2, Cl2, Br2 and I2. Which can undergo disproportionation reactions?

Chlorine undergoes disproportionation in alkaline medium as shown below: {aCl_2(g) + bOH^{-}(aq) cClO^{-}(aq) + dCl^{-}(aq) + eH_2O(l)} The values of a, b, c and d in a balanced redox reaction are…

Which of the following reactions are disproportionation reactions? (1) Cu+ Cu2+ + Cu (2) 3MnO42- + 4H+ 2MnO4- + MnO2 + 2H2O (3) 2KMnO4 K2MnO4 + MnO2 + O2 (4) 2MnO4- + 3Mn2+ + 2H2O 5MnO2 + 4H+ Choose…

In acidic medium, K2Cr2O7 shows oxidising action as represented in the half reaction: {Cr_2O_7^{2-} + XH^{+} + Ye^{-} 2A + ZH_2O} X, Y, Z and A are respectively:

Identify the incorrect statements regarding primary standard of titrimetric analysis. (A) It should be purely available in dry form. (B) It should not undergo chemical change in air. (C) It should be…

KMnO4 decomposes on heating at 513 K to form O2 along with

Given below are two statements: Statement (I): Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution. Statement (II): In this titration phenolphthalein…

Strong reducing and oxidizing agents among the following, respectively, are

Which of the following options are correct for the reaction? 2[{Au(CN)_2}]^{-}({aq}) + {Zn}({s}) 2{Au}({s}) + [{Zn(CN)_4}]^{2-}({aq}) A. Redox reaction B. Displacement reaction C. Decomposition…

Given below are two statements: Statement I: In redox titration, the indicators used are sensitive to change in pH of the solution. Statement II: In acid-base titration, the indicators used are…

2IO3- + xI- + 12H+ 6I2 + 6H2O. What is the value of x?

The volume of 0.02 M aqueous HBr required to neutralize 10.0 mL of 0.01 M aqueous Ba(OH)2 is (Assume complete neutralization)

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): An aqueous solution of KOH when used for volumetric analysis, its…

During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.

Which one of the following is an example of disproportionation reaction?

Which of the given reactions is not an example of disproportionation reaction?

The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)

Given below are two statements: Statement I: S8 solid undergoes disproportionation reaction under alkaline conditions to form S2- and S2O32-. Statement II: ClO4- can undergo disproportionation…

The neutralization occurs when 10 mL of 0.1 M acid 'A' is allowed to react with 30 mL of 0.05 M base M(OH)2. The basicity of the acid 'A' is [M is a metal]

A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with CH3COOH. Compound 'X' exists in ionized form in basic medium. The…

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Phenolphthalein is a pH dependent indicator, remains colourless in acidic solution…

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Permanganate titrations are not performed in presence of hydrochloric acid. Reason…

Identify the process in which change in the oxidation state is five:

The oxidation states of nitrogen in NO, NO2, N2O and NO3- are in the order of:

(A) HOCl + H2O2 H3O+ + Cl- + O2 (B) I2 + H2O2 + 2OH- 2I- + 2H2O + O2 Choose the correct option:

The species given below that does NOT show disproportionation reaction is:

In polythionic acid, H2SxO6 (x = 3 to 5) the oxidation state(s) of sulphur is/are:

The oxidation states of P in H4P2O7, H4P2O5 and H4P2O6, respectively, are:

In which one of the following sets all species show disproportionation reaction?

Cu2+ salt reacts with potassium iodide to give

The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1\ M\ H3PO3 solution and 100 mL of 2\ M\ H3PO2 solution, respectively, are:

The redox reaction among the following is

Oxidation number of potassium in K2O, K2O2 and KO2, respectively, is:

While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?

The compound that cannot act both as oxidizing and reducing agent is

100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL 0.1 M NaOH is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH?

An example of a disproportionation reaction is

50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. What is the amount of NaOH in 50 mL of the given sodium hydroxide solution?

Given: Co3+ + e- Co2+; E = +1.81\ V Pb4+ + 2e- Pb2+; E = +1.67\ V Ce4+ + e- Ce3+; E = +1.61\ V Bi3+ + 3e- Bi; E = +0.20\ V Oxidizing power of the species will increase in the order:

Given that, EO2/H2O = +1.23\ V; ES2O82-/SO42- = +2.05\ V EBr2/Br- = +1.09\ V; EAu3+/Au = +1.4\ V The strongest oxidizing agent is

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is:

In order to oxidize a mixture of one mole of each of FeC2O4, Fe2(C2O4)3, FeSO4 and Fe2(SO4)3 in acidic medium, the number of moles of KMnO4 is: