Consider the reaction : H 2 SO 3 aq + Sn aq 4 + + H 2 O l ⁡ → Sn aq 2 + + HSO 4 aq - + 3 H aq + Which of the following statements is correct ?

H 2 SO 3 is the reducing agent because it undergoes oxidation

Sn 4 + is the oxidizing agent because it undergoes oxidation

Sn 4 + is the reducing agent because it undergoes oxidation

H 2 SO 3 is the reducing agent because it undergoes reduction

EASY

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When ${KMnO}_{4}$ solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time. This is because-

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Important Questions on Redox Reactions

HARD

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

The redox reaction among the following is:

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

How many electrons are involved in the following redox reaction ?

{Cr}_{2} O_{7}^{2 -} + {Fe}^{2 +} + C_{2} O_{4}^{2 -} \to {Cr}^{3 +} + {Fe}^{3 +} + {CO}_{2}

(Unbalanced)

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

(a) H_{2} O_{2} + O_{3} \to H_{2} O + 2 O_{2}

{(b) H}_{2} O_{2} + A g_{2} O \to 2 A g + H_{2} O + O_{2}

Role of hydrogen peroxide in the above reactions is respectively:

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

{SO}_{2} + 2 HS \to 3 S + 2 H_{2} O

This equation represents preparation of sulphur sol by

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Which of the following reactions is an example of a redox reaction?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

A filter paper soaked in salt

X

turns brown when exposed to

{HNO}_{3}

vapor. The salt

X

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

The pair of compounds that can exist together is:

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Which of the following is not true for oxidation?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Which among the following compounds does not act as a reducing agent?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

In which of the following reactions

H_{2} O_{2}

acts as a reducing agent ?

(a) H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O

(b) H_{2} O_{2} - 2 e^{-} \to O_{2} + 2 H^{+}

(c) H_{2} O_{2} + 2 e^{-} \to 2 {OH}^{-}

(d) H_{2} O_{2} + 2 {OH}^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Strongest reducing agent among the following is

(i) ${Na}^{+} + e^{-} \to {Na}_{(S)} - 2.7 E^{Θ} / v$

(ii) ${Al}^{3 +} + 3 e^{-} \to {Al}_{(S)} - 1.66 E^{θ} / v$

(iii) $F_{2 (g)} + 2^{e -} \to 2 F^{-} + 2.87 E^{O} / v$

(iv) $2 H_{2} O + 2 e^{-} \to F_{2 (g)} + 2 {OH}^{-} {}_{(9 g)}- 0.83 E^{Θ} / v$

HARD

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Which of the following processes does not involve oxidation of iron?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Which of the following equation depicts the oxidizing nature of

H_{2} O_{2}

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Which of the following statement is incorrect regarding the equation

MeCHO + {[Ag {({NH}_{3})}_{2}]}^{+} + \bar{O} H ⟶ {MeCOO}^{-} + Ag

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are respectively:

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

The equivalent weight of

{KMnO}_{4}

in acidic and strongly alkaline medium, respectively, are,

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

In the electrolysis of a

{CuSO}_{4}

solution, how many grams of

Cu

are plated out on the cathode, in the time that is required to liberate

5.6 L

O_{2} (g)

, measured at

1 atm

and

273 K

, at the anode?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Consider the reaction :

H_{2} {SO}_{3 (aq)} + {Sn}_{(aq)}^{4 +} + H_{2} O_{(l)} \to {Sn}_{(aq)}^{2 +} + {HSO}_{4 (aq)}^{-} + 3 H_{(aq)}^{+}

Which of the following statements is correct ?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Classical Idea of Redox Reactions

Which of the following is NOT an oxidation reduction?

When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time. This is because-

Important Questions on Redox Reactions

Learn and Prepare for any exam you want !

When ${KMnO}_{4}$ solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time. This is because-