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Chemistry Part-I

The d-and f-Block Elements

Describe the preparation of potassium permanganate. How does t

Chemistry Part-I

Class 12

NCERT

Chapter 1: The Solid State

31 questions

Chapter 2: Solutions

54 questions

Chapter 3: Electrochemistry

28 questions

Chapter 4: Chemical Kinetics

40 questions

Chapter 5: Surface Chemistry

27 questions

Chapter 6: General Principles and Processes of Isolation of Elements

30 questions

Chapter 7: The p-Block Elements

62 questions

Chapter 8: The d-and f-Block Elements

48 questions

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
(i) iodide (ii) iron(II) solution and (iii)

H_{2} S

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii)

S O_{2}

and (iii) oxalic acid? Write the ionic equations for the reactions.

For

M^{2 +} / M

and

M^{3 +} / M^{2 +}

systems the

E^{⊖}

values for some metals are as follows:

C r^{2 +} / C r

Use this data to comment upon:
(i) the stability of

- 0.9 V

in acid solution as compared to that of

C r^{3} / C r^{2 +}

- 0.4 V

and
(ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal

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Chapter 9: Coordination Compounds

38 questions

Question

Medium

Solving time: 5 mins

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) $S O_{2}$ and (iii) oxalic acid? Write the ionic equations for the reactions.

Name: Video solution 1: [Solved] Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) SO2 and (iii) oxalic acid? Write the ionic equations for the reactions. - Chemistry Part-I
Uploaded: 2023-02-26T06:56:46.000Z
Duration: 5 min
Description: Video solution 1: [Solved] Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) SO2 and (iii) oxalic acid? Write the ionic equations for the reactions. - Chemistry Part-I

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Updated on: Feb 26, 2023

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Chemistry Part-I (NCERT)

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Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii)

S O_{2}

and (iii) oxalic acid? Write the ionic equations for the reactions.

15 mins ago

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15 mins ago

Text solutionVerified

Preparation of potassium permanganate,

K M n O_{4}

from pyrolusite ore

M n O_{2}

.
(i) Pyrolusite ore is fused with

K O H

(or

K_{2} C O_{3}

) in presence of air (or oxidising agents such as

K N O_{3}

K Cl O_{3}

) to give potassium manganate

K_{2} M n O_{4}

(green mass).

2 MN O_{2} + 4 K O H + O_{2} De lt a 2 K_{2} M n O_{4} + 2 H_{2} O

(ii) Extraction of green mass with water followed by oxidation with chlorine (or ozone or

C O_{2}

) gives potassium permanganate.

2 K_{2} M n O_{4} + C l_{2} \to 2 K Cl + 2 K M n O_{4}

On concentrating the solution, dark purple crystals of potassium permanganate separates out.
Note: In neutral or acidic medium, manganate ion will disproportionate to permanganate ion.

3 M n O_{4}^{2 -} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O

Convertion of manganate to permanganate can also be carried by electrolytic oxidation.
Reactions of acidified permanganate solution with (i) iron(II) ions (ii)

S O_{2}

and (iii) oxalic acid:

2 M n O_{4}^{-} + 10 F e^{2 +} + 16 H^{+} \to 2 M n^{2 +} + 10 F e^{3 +} + 8 H_{2} O

2 M n O_{4}^{-} + 5 S O_{2} + 2 H_{2} O \to 5 S O_{4}^{2 -} + 2 M n^{2 +} + 4 H^{+}

2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \to 2 M n^{2 +} + 8 H_{2} O + 10 C O_{2}

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Practice more questions from Chemistry Part-I (NCERT)

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
(i) iodide (ii) iron(II) solution and (iii)

H_{2} S

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii)

S O_{2}

and (iii) oxalic acid? Write the ionic equations for the reactions.

For

M^{2 +} / M

and

M^{3 +} / M^{2 +}

systems the

E^{⊖}

values for some metals are as follows:

C r^{2 +} / C r

Use this data to comment upon:
(i) the stability of

- 0.9 V

in acid solution as compared to that of

C r^{3} / C r^{2 +}

- 0.4 V

and
(ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal

View all

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Question Text	Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) $S O_{2}$ and (iii) oxalic acid? Write the ionic equations for the reactions.
Updated On	Feb 26, 2023
Topic	The d-and f-Block Elements
Subject	Chemistry
Class	Class 12
Answer Type	Text solution:1 Video solution: 2
Upvotes	192
Avg. Video Duration	7 min

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) $S O_{2}$ and (iii) oxalic acid? Write the ionic equations for the reactions.

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Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) SO2​ and (iii) oxalic acid? Write the ionic equations for the reactions.

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Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) $S O_{2}$ and (iii) oxalic acid? Write the ionic equations for the reactions.