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

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Reaction of Lead Oxide $(P b O)$ and Hydrogen Gas $(H_{2})$ leads to

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Important Questions on Redox Reactions

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

(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:

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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:

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

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}

HARD

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

The redox reaction among the following is:

HARD

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

The Plot of

pH

-metric titration of weak base

{NH}_{4} OH

vs strong acid

HCl

looks like

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 ?

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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

Which of the following is not true for oxidation?

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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?

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

A transition metal exists in its highest oxidation state. It is expected to behave as

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

A compound '

X

' is a weak acid and it exhibits colour change at

pH

close to the equivalence point during neutralization of

NaOH

with

{CH}_{3} COOH

. Compound '

X

' exists in ionized form in basic medium. The compound '

X

' is

EASY

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

Given below are two statements :
Statement I :

H_{2} O_{2}

is used in the synthesis of Cephalosporin
Statement II :

H_{2} O_{2}

is used for the restoration of aerobic conditions to sewage wastes.
In the light of the above statements, choose the most appropriate answer from the options given below :

EASY

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

In which of the following reactions the hydrogen peroxide acts as a reducing agent?

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

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

Reaction of Lead Oxide (PbO) and Hydrogen Gas (H2) leads to

Important Questions on Redox Reactions

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Reaction of Lead Oxide $(P b O)$ and Hydrogen Gas $(H_{2})$ leads to