# Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 6 - Redox Reactions [Latest edition]

## Chapter 6: Redox Reactions

Exercises
Exercises [Pages 91 - 92]

### Balbharati solutions for Chemistry 11th Standard Maharashtra State Board Chapter 6 Redox Reactions Exercises [Pages 91 - 92]

Exercises | Q 1. (A) | Page 91

Choose the correct option.

Oxidation numbers of Cl atoms marked as Cla and Clb in CaOCl2 (bleaching powder) are

$\begin{array}{cc} \ce{Cl^{{a}}}\phantom{.} \\/\phantom{...} \\ \ce{Ca}\phantom{......} \\ \backslash\phantom{..} \\\phantom{........} \ce{O-Cl^{{b}}}\phantom{.} \end{array}$

• zero in each

• -1 in Cla and +1 in Clb

• +1 in Cla and -1 in Clb

• 1 in each

Exercises | Q 1. (B) | Page 91

Choose the correct option.

Which of the following is not an example of redox reaction?

• $\ce{CuO + H2->Cu + H2O}$

• $\ce{Fe2O3 + 3CO2->2Fe + 3CO2}$

• $\ce{2K + F2->2KF}$

• $\ce{BaCl2 + H2SO4->BaSO4 + 2HCl}$

Exercises | Q 1. (C) | Page 91

Choose the correct option.

A compound contains atoms of three elements A, B, and C. If the oxidation state of A is +2, B is +5 and that of C is -2, the compound is possibly represented by

• A2(BC3)2

• A3(BC4)2

• A3(B4C)2

• ABC2

Exercises | Q 1. (D) | Page 91

Choose the correct option.

The coefficients p, q, r, s in the reaction $\ce{{p}Cr2O7^{2Θ} + {q}Fe^{2⊕}->{r}Cr^{3⊕} + {s}Fe^{3⊕} + H2O}$ respectively are:

• 1, 2, 6, 6

• 6, 1, 2, 4

• 1, 6, 2, 6

• 1, 2, 4, 6

Exercises | Q 1. (E) | Page 91

Choose the correct option.

For the following redox reactions, find the correct statement.

$\ce{Sn^{2⊕} + 2Fe^{3⊕}->Sn^{4⊕} + 2Fe^{2⊕}}$

• Sn2⊕ is undergoing oxidation

• Fe3⊕ is undergoing oxidation

• It is not a redox reaction

• Both Sn2⊕ and Fe3⊕ are oxidized

Exercises | Q 1. (F) | Page 91

Choose the correct option.

Oxidation number of carbon in H2CO3 is

• +1

• +2

• +3

• +4

Exercises | Q 1. (G) | Page 91

Choose the correct option.

Which is the correct stock notation for manganese dioxide?

• Mn(I)O2

• Mn(II)O2

• Mn(III)O2

• Mn(IV)O2

Exercises | Q 1. (H) | Page 91

Choose the correct option.

Oxidation number of oxygen in superoxide is

• −2

• −1

• -1/2

• 0

Exercises | Q 1. (I) | Page 91

Choose the correct option.

Which of the following halogens does always show oxidation state -1?

• F

• Cl

• Br

• I

Exercises | Q 1. (J) | Page 91

Choose the correct option.

The process $\ce{SO2->S2Cl2}$ is

• Reduction

• Oxidation

• Neither oxidation nor reduction

• Oxidation and reduction

Exercises | Q 2. (A) | Page 91

Write the formula for the following compound:

Mercury(II) chloride

Exercises | Q 2. (B) | Page 91

Write the formula for the following compound:

Thallium(I) sulphate

Exercises | Q 2. (C) | Page 91

Write the formula for the following compound:

Tin(IV) oxide

Exercises | Q 2. (D) | Page 91

Write the formula for the following compound:

Chromium(III) oxide

Exercises | Q 3. (A) | Page 91

In which chemical reaction does carbon exhibit variation of oxidation state from - 4 to + 4? Write a balanced chemical reaction.

Exercises | Q 3. (B) | Page 91

In which reaction does nitrogen exhibit variation of oxidation state from –3 to +5?

Exercises | Q 3. (C)(a) | Page 92

Calculate the oxidation number of the underlined atom.

H2SO4

Exercises | Q 3. (C)(b) | Page 92

Calculate the oxidation number of the underlined atom.

HNO3

Exercises | Q 3. (C)(c) | Page 92

Calculate the oxidation number of the underlined atom.

H3PO3

Exercises | Q 3. (C)(d) | Page 92

Calculate the oxidation number of the underlined atom.

K2C2O4

Exercises | Q 3. (C)(e) | Page 92

Calculate the oxidation number of the underlined atom.

H2S4O6

Exercises | Q 3. (C)(f) | Page 92

Calculate the oxidation number of the underlined atom.

Cr2O72−

Exercises | Q 3. (C)(g) | Page 92

Calculate the oxidation number of the underlined atom.

NaH2PO4

Exercises | Q 3. (D)(c) | Page 92

Justify that the following reaction is redox reaction; identify the species oxidized/reduced, which acts as an oxidant and which acts as a reductant.

$\ce{I2_{(aq)} + 2S2O^{2-}_{3(aq)}->S4O^{2-}_{6(aq)} + 2I^-_{ (aq)}}$

Exercises | Q 3. (D)(a) | Page 92

Justify that the following reaction is redox reaction; identify the species oxidized/reduced, which acts as an oxidant and which acts as a reductant.

$\ce{2Cu2O_{(S)} + Cu2S_{(S)}->6Cu_{(S)} + SO2_{(g)}}$

Exercises | Q 3. (D)(b) | Page 92

Justify that the following reaction is redox reaction; identify the species oxidized/reduced, which acts as an oxidant and which acts as a reductant.

$\ce{HF_{(aq)} + {OH}^-_{ (aq)}->H2O_{(l)} + {F}^ -_{ (aq)}}$

Exercises | Q 3. (E) | Page 92

What is oxidation?

Exercises | Q 3. (E)(a) | Page 92

Identify the following pair of species is in its oxidized state?

Mg/Mg2+

Exercises | Q 3. (E)(b) | Page 92

Identify the following pair of species is in its oxidized state?

Cu/Cu2+

Exercises | Q 3. (E)(c) | Page 92

Identify the following pair of species is in its oxidized state?

O2/O2−

Exercises | Q 3. (E)(d) | Page 92

Identify the following pair of species is in its oxidized state?

Cl2/Cl

Exercises | Q 6. (F) | Page 92

Justify the following reaction as a redox reaction.

$\ce{2Na_{(s)} + S_{(s)}->Na2S_{(s)}}$

Find out the oxidizing and reducing agents.

Exercises | Q 3. (G) | Page 92

Provide the stock notation for the following compound:

HAuCl4

Exercises | Q 3. (G) | Page 92

Provide the stock notation for the following compound:

Tl2O

Exercises | Q 3. (G) | Page 92

Provide the stock notation for the following compound:

FeO

Exercises | Q 3. (G) | Page 92

Provide the stock notation for the following compound:

Fe2O3

Exercises | Q 3. (G) | Page 92

Provide the stock notation for the following compound:

MnO

Exercises | Q 3. (G) | Page 92

Provide the stock notation for the following compound:

CuO

Exercises | Q 3. (H)(a) | Page 92

Assign oxidation number atom in the following species.

$\ce{Cr(OH)^Θ_4}$

Exercises | Q 3. (H)(b) | Page 92

Assign oxidation number atom in the following species.

Na2S2O3

Exercises | Q 3. (H)(c) | Page 92

Assign oxidation number atom in the following species.

H3BO3

Exercises | Q 3. (I)(a) | Page 92

Which of the following redox couple is a stronger oxidizing agent?

Cl2 (E0 = 1.36 V) and Br2 (E0 = 1.09 V)

Exercises | Q 3. (I)(b) | Page 92

Which of the following redox couple is a stronger oxidizing agent?

$\ce{MnO^Θ_4}$(E0 = 1.51 V) and $\ce{Cr2O^{2Θ}_7}$(E0 = 1.33 V)

Exercises | Q 3. (J)(a) | Page 92

Which of the following redox couple is a stronger reducing agent?

Li (E0 = - 3.05 V) and Mg (E0 = - 2.36 V)

Exercises | Q 3. (J)(b) | Page 92

Which of the following redox couple is a stronger reducing agent?

Zn (E0 = - 0.76 V) and Fe (E0 = - 0.44 V)

Exercises | Q 4. (A)(a) | Page 92

Balance the following reaction by oxidation number method.

$\ce{Cr2O^2-_{7(aq)} + SO^2-_{3(aq)}->Cr^3+_{ (aq)} + SO^2-_{4(aq)}(acidic)}$

Exercises | Q 4. (A)(b) | Page 92

Balance the following reaction by oxidation number method.

$\ce{MnO^-_{4(aq)} + Br^-_{ (aq)}->MnO2_{ (s)} + BrO^-_{3(aq)}(basic)}$

Exercises | Q 4. (A)(c) | Page 92

Balance the following reaction by oxidation number method.

$\ce{H2SO4_{(aq)} + C_{(s)}->CO2_{(g)} + SO2_{(g)} + H2O_{(l)}(acidic)}$

Exercises | Q 4. (A)(d) | Page 92

Balance the following reaction by oxidation number method.

$\ce{Bi(OH)_{3(s)} + Sn(OH)^-_{3(aq)}->Bi_{(s)} + Sn(OH)^2-_{6(aq)}(basic)}$

Exercises | Q 4. (B)(a) | Page 92

Balance the following redox equation by half-reaction method.

$\ce{H2C2O_{4(aq)} + MnO^-_{4(aq)}->CO2_{(g)} + Mn^2+_{( aq)}(acidic)}$

Exercises | Q 4. (B)(b) | Page 92

Balance the following redox equation by half-reaction method.

$\ce{Bi(OH)_{3(s)} + SnO^2-_{2(aq)}->SnO^2-_{3(aq)} + Bi^_{(s)}(basic)}$

Exercises | Q 5 | Page 92

Complete the following table:

Assign oxidation number to the underlined species and write Stock notation of compound

 Compound Oxidation number Stock notation AuCl3 SnCl2 $\ce{\underline{{V}}_2O^{4-}_{7}}$ $\ce{\underline{{Pt}}Cl^2-_6}$ H3AsO3

Exercises

## Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 6 - Redox Reactions

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Concepts covered in Chemistry 11th Standard Maharashtra State Board chapter 6 Redox Reactions are Introduction of Redox Reactions, Oxidation Number, Balancing of Redox Reactions, Redox Reaction and Electrode Potential.

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