Oxidation and Reduction

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JEE Advanced 2014

LEVELJEE Main

Hydrogen peroxide in its reaction with $KIO_{4}$ and $NH_{2} OH$ respectively, is acting as a

(A)

reducing agent, oxidising agent

(B)

reducing agent, reducing agent

(C)

oxidising agent, oxidising agent

(D)

oxidising agent, reducing agent

JEE Advanced 2023

LEVELJEE Advanced

Consider the following molecules : $Br_{3} O_{8}$ , $F_{2} O$ , $H_{2} S_{4} O_{6}$ , $H_{2} S_{5} O_{6}$ , and $C_{3} O_{2}$ . Count the number of atoms existing in their zero oxidation state in each molecule. Their sum is______.

JEE Advanced 2016

LEVELJEE Advanced

In neutral or faintly alkaline solution, 8 moles permanganate anion quantitatively oxidize thiosulphate anions to produce X moles of a sulphur containing product. the magnitude of X is

JEE Advanced 2020

LEVELJEE Main

In the chemical reaction between stoichiometric quantities of $KMnO_{4}$ and $KI$ in weakly basic solution, what is the number of moles of $I_{2}$ released for 4 moles of $KMnO_{4}$ consumed?

JEE Main 2021

LEVELJEE Main

$Cu^{2 +}$ salt reacts with potassium iodide to give

(A)

Cu_{2} I_{2}

(B)

Cu_{2} I_{3}

(C)

CuI

(D)

Cu (I_{3})_{2}

JEE Main 2021

LEVELJEE Advanced

In basic medium $CrO_{4}^{2 -}$ oxidises $S_{2} O_{3}^{2 -}$ to form $SO_{4}^{2 -}$ and itself changes into $Cr(OH)_{4}^{-}$ . The volume of $0.154 M CrO_{4}^{2 -}$ required to react with $40 mL$ of $0.25 M S_{2} O_{3}^{2 -}$ is ............ mL (Rounded off to the nearest integer).

JEE Main 2020

LEVELJEE Main

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

(A)

H_{2} SO_{3}

(B)

H_{3} PO_{4}

(C)

HNO_{2}

(D)

H_{2} O_{2}

JEE Main 2019

LEVELJEE Main

An example of a disproportionation reaction is

(A)

2 MnO_{4}^{-} + 10 I^{-} + 16 H^{+} ⟶ 2 Mn^{2 +} + 5 I_{2} + 8 H_{2} O

(B)

2 NaBr + Cl_{2} ⟶ 2 NaCl + Br_{2}

(C)

2 KMnO_{4} ⟶ K_{2} MnO_{4} + MnO_{2} + O_{2}

(D)

2 CuBr ⟶ CuBr_{2} + Cu

JEE Main 2005

LEVELJEE Main

The oxidation state of Cr in $[Cr (NH_{3})_{4} Cl_{2}]^{+}$ is

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

(A)

ClO_{2}^{-}, F_{2}, MnO_{4}^{2 -} and Cr_{2} O_{7}^{2 -}

(B)

Cr_{2} O_{7}^{2 -}, MnO_{4}^{-}, ClO_{2}^{-} and Cl_{2}

(C)

ClO_{2}^{-}, Cl_{2} and Mn^{3 +}

(D)

ClO_{4}^{-}, MnO_{4}^{2 -}, ClO_{2}^{-} and F_{2}

LEVELJEE Main

Which of the following is a redox reaction ?

(A)

NaCl + KNO_{3} ⟶ NaNO_{3} + KCl

(B)

CaC_{2} O_{4} + 2 HCl ⟶ CaCl_{2} + H_{2} C_{2} O_{4}

(C)

Ca(OH)_{2} + 2 NH_{4} Cl ⟶ CaCl_{2} + 2 NH_{3} + 2 H_{2} O

(D)

2 K [Ag(CN)_{2}] + Zn ⟶ 2 Ag + K_{2} [Zn(CN)_{4}]

LEVELJEE Main

Oxidation number of $Cl$ in $CaOCl_{2}$ (bleaching powder) is

(A)

zero, since it contains

Cl_{2}

(B)

- 1

, since it contains

Cl^{-}

(C)

+ 1

, since it contains

ClO^{-}

(D)

+ 1

and

- 1

, since it contains

ClO^{-}

and

Cl^{-}

JEE Main 2017

LEVELJEE Main

Sodium salt of an organic acid 'X' produces effervescence with conc. $H_{2} S O_{4}$ . 'X' reacts with the acidified aqueous $C a C l_{2}$ solution to give a white precipitate which decolourises acidic solution of $K M n O_{4}$ . 'X' is

(A)

C_{6} H_{5} C O O N a

(B)

H C O O N a

(C)

C H_{3} C O O N a

(D)

N a_{2} C_{2} O_{4}

LEVELBoard

$MnO_{4}^{-}$ is a good oxidising agent in different medium changing to $MnO_{4}^{-} ⟶ Mn^{2 +}$ $⟶ MnO_{4}^{2 -}$ $⟶ MnO_{2}$ $⟶ Mn_{2} O_{3}$ Changes in oxidation number respectively, are

In basic medium, $H_{2} O_{2}$ exhibits which of the following reactions ? A. $M n^{2 +} \to M n^{4 +}$ B. $I_{2} \to I^{-}$ C. $P b S \to P b S O_{4}$ Choose the most appropriate answer from the options given below.

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

(A)

Cr_{2} O_{7}^{2 -} ⟶ 2 Cr^{3 +}

(B)

MnO_{4}^{-} ⟶ Mn^{2 +}

(C)

CrO_{4}^{2 -} ⟶ Cr^{3 +}

(D)

C_{2} O_{4}^{2 -} ⟶ 2 CO_{2}

LEVELJEE Advanced

Among the properties (A) reducing, (B) oxidising and (C) complexing, the set of properties shown by $CN^{-}$ ion towards metal species is

Which of the following equation depicts the oxidising nature of $H_{2} O_{2}$ ?

(A)

K I O_{4} + H_{2} O_{2} ⟶ K I O_{3} + H_{2} O + O_{2}

(B)

I_{2} + H_{2} O_{2} + 2 O H^{-} ⟶ 2 I^{-} + 2 H_{2} O + O_{2}

(C)

2 I^{-} + H_{2} O_{2} + 2 H^{+} ⟶ I_{2} + 2 H_{2} O

(D)

C l_{2} + H_{2} O_{2} ⟶ 2 H C l + O_{2}

LEVELJEE Main

Amount of oxalic acid present in a solution can be determined by its titration with $KMnO_{4}$ solution in the presence of $H_{2} SO_{4}$ . The titration gives unsatisfactory result when carried out in the presence of HCl because HCl

(A)

gets oxidised by oxalic acid to chlorine

(B)

furnishes

H^{+}

ions in addition to those from oxalic acid

(C)

reduces permanganate to

Mn^{2 +}

(D)

oxidises oxalic acid to carbon dioxide and water

JEE Main 2020

LEVELBoard

Oxidation number of potassium in $K_{2} O$ , $K_{2} O_{2}$ and $K O_{2}$ , respectively, is

(A)

+ 1, + 4

and

+ 2

(B)

+ 1, + 2

and

+ 4

(C)

+ 1, + 1

and

+ 1

(D)

+ 2, + 1

and

+ \frac{1}{2}

JEE Main 2021

LEVELJEE Main

Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ………… .

JEE Main 2021

LEVELJEE Main

The species given below that does not show disproportionation reaction is

(A)

BrO_{4}^{-}

(B)

BrO^{-}

(C)

BrO_{2}^{-}

(D)

BrO_{3}^{-}

JEE Main 2019

LEVELJEE Advanced

In order to oxidise a mixture of one mole of each of $FeC_{2} O_{4}$ , $Fe_{2} (C_{2} O_{4})_{3}$ , $FeSO_{4}$ and $Fe_{2} (SO_{4})_{3}$ in acidic medium, the number of moles of $KMnO_{4}$ required is

The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are $x, y$ and $z$ . The sum of $x, y$ and $z$ is $Na_{4} [Fe (CN)_{5} (NOS)]$ , (A) $Na_{4} [FeO_{4}]$ , (B) $[Fe_{2} (CO)_{9}]$ (C)

JEE Main 2006

LEVELJEE Main

Which of the following chemical reactions depicts the oxidising behaviour of $H_{2} SO_{4}$ ?

(A)

2 HI + H_{2} SO_{4} ⟶ I_{2} + SO_{2} + 2 H_{2} O

(B)

Ca(OH)_{2} + H_{2} SO_{4} ⟶ CaSO_{4} + 2 H_{2} O

(C)

NaCl + H_{2} SO_{4} ⟶ NaHSO_{4} + HCl

(D)

2 PCl_{5} + H_{2} SO_{4} ⟶ 2 POCl_{3} + 2 HCl + SO_{2} Cl_{2}

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In neutral or faintly alkaline solution, 8 moles permanganate anion quantitatively oxidize thiosulphate anions to produce X moles of a sulphur containing product. the magnitude of X is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Cu2+ salt reacts with potassium iodide to give

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

An example of a disproportionation reaction is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The oxidation state of Cr in [Cr(NH3​)4​Cl2​]+ is

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

Which of the following is a redox reaction ?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Oxidation number of Cl in CaOCl2​ (bleaching powder) is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } MnO4−​ is a good oxidising agent in different medium changing to MnO4−​⟶Mn2+ ⟶MnO42−​ ⟶MnO2​ ⟶Mn2​O3​ Changes in oxidation number respectively, are

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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Among the properties (A) reducing, (B) oxidising and (C) complexing, the set of properties shown by CN− ion towards metal species is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Which of the following equation depicts the oxidising nature of H2​O2​?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Oxidation number of potassium in K2​O, K2​O2​ and KO2​, respectively, is

Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ………… .

The species given below that does not show disproportionation reaction is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Which of the following chemical reactions depicts the oxidising behaviour of H2​SO4​?

Hydrogen peroxide in its reaction with $KIO_{4}$ and $NH_{2} OH$ respectively, is acting as a

$Cu^{2 +}$ salt reacts with potassium iodide to give

The oxidation state of Cr in $[Cr (NH_{3})_{4} Cl_{2}]^{+}$ is

Oxidation number of $Cl$ in $CaOCl_{2}$ (bleaching powder) is

$MnO_{4}^{-}$ is a good oxidising agent in different medium changing to $MnO_{4}^{-} ⟶ Mn^{2 +}$ $⟶ MnO_{4}^{2 -}$ $⟶ MnO_{2}$ $⟶ Mn_{2} O_{3}$ Changes in oxidation number respectively, are

Among the properties (A) reducing, (B) oxidising and (C) complexing, the set of properties shown by $CN^{-}$ ion towards metal species is

Which of the following equation depicts the oxidising nature of $H_{2} O_{2}$ ?

Oxidation number of potassium in $K_{2} O$ , $K_{2} O_{2}$ and $K O_{2}$ , respectively, is

Which of the following chemical reactions depicts the oxidising behaviour of $H_{2} SO_{4}$ ?