Classify the following unbalanced half equations as oxidation and reduction. Example Type Cl ⊝ ( aq ) → Cl 2 ( g ) OCl ⊝ ( aq ) → Cl ⊝ ( g ) Fe ( OH ) 2 → Fe ( OH ) 3 VO 2 ⊕ ( aq ) → V 3 ⊕ ( aq )

A half-reaction is either the oxidation or reduction reaction component of a redox reaction. A half-reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction. Increase in oxidation number shows the oxidation reaction and decrease in oxidation number shows the reduction reaction. Example Type Cl ⊝ ( aq ) → Cl 2 ( g ) Oxidation OCl ⊝ ( aq ) → Cl ⊝ ( g ) Reduction Fe ( OH ) 2 → Fe ( OH ) 3 Oxidation VO 2 ⊕ ( aq ) → V 3 ⊕ ( aq ) Oxidation

E M B I B E

Chemistry>Chapter 6 - Redox Reactions>Exercises>Q 5

HARD

11th Maharashtra Board

IMPORTANT

Earn 100

Complete the following table:

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

Compound
Oxidation

number

Stock

Notation

$Au {Cl}_{3}$

$Sn {Cl}_{2}$

$V_{2} {O_{7}}^{4 -}$

$Pt {Cl}_{6}^{2 -}$

$H_{3} As O_{3}$

.

Important Questions on Redox Reactions

MEDIUM

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Can you tell?>Q 1

Why does cut apple turn brown when exposed to air?

MEDIUM

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Can you tell?>Q 2

Why does old car bumpers change colour?

MEDIUM

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Can you tell?>Q 3

Why do new batteries become useless after some days?

HARD

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Can you recall?>Q 1

What is combustion reaction?

MEDIUM

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Can you recall?>Q 2

Write an equation for combustion of methane?

MEDIUM

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Can you recall?>Q 3

What is the driving force behind reactions of elements?

MEDIUM

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Try this

Complete the following table of displacement reactions. Identify oxidising and reducing agents involved.

Reactants	Products
$Zn (s) + \dots \dots (aq)$	$\dots \dots (aq) + Cu (s)$
$Cu (s) + 2 {Ag}^{+} (aq)$	$\dots \dots + \dots \dots$
$\dots \dots + \dots \dots$	${Co}^{2 +} (aq) + Ni (s)$

MEDIUM

11th Maharashtra Board

IMPORTANT

Chemistry>Chapter 6 - Redox Reactions>Try this

Classify the following unbalanced half equations as oxidation and reduction.

Example	Type
${Cl}^{⊝} (aq) \to {Cl}_{2} (g)$
${OCl}^{⊝} (aq) \to {Cl}^{⊝} (g)$
$Fe (OH)_{2} \to Fe (OH)_{3}$
${VO}^{2 \oplus} (aq) \to V^{3 \oplus} (aq)$