Redox Reactions Test

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Redox Reactions Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

All combustion reactions, which make use of elemental dioxygen, as well as other reactions involving elements other than dioxygen are

A
disproportionation reactions

B
displacement reactions

C
decomposition reactions

D
Combination reaction

Solution

A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product). Such reactions may be represented by equations of the following form: X + Y → XY.
Question 2
1 / -0

In the reaction HAsO₂ + Sn²⁺ → As + Sn⁴⁺ + H₂O, the oxidising agent is

A
Sn²⁺

B
Sn⁴⁺

C
As

D
HAsO₂
Question 3
1 / -0

Acidified KMnO₄ oxidises oxalic acid to CO₂. What volume (in litres) of 10^-4 M KMnO₄ is required to completely oxidise 0.5 L of 10^-2 M oxalic acid in acidic medium?

A
125

B
1250

C
200

D
20
Question 4
1 / -0

Which of the following reactions involves both oxidation and reduction?

A
NaBr + HCl → NaCl + HBr

B
HBr + AgNO₃ → AgBr + HNO₃

C
H₂ + Br₂ → 2HBr

D
Na₂O + H₂SO₄ → Na₂SO₄ + H₂O
Question 5
1 / -0

The oxidation number of oxygen in most compounds is

A
4

B
1

C
-2

D
-3

Solution

Oxygen is the most electronegative element. Oxygen have 6 electrons in its outermost shell and to gain noble gas configuration oxygen have to take 2 more electrons.
Question 6
1 / -0

Equivalent mass of oxidising agent in the reaction SO₂ + 2H₂S → 3S + 2H₂O is

A
32 g

B
64 g

C
16 g

D
8 g
Question 7
1 / -0

The highest value of oxidation number changes from 1 to 7

A
In alkaline earth metals

B
the first three groups

C
across the third period in the periodic table

D
in the atoms of transition elements

Solution

The highest value of oxidation number exhibited by an atom of an element generally increases across the period in the periodic table.
Question 8
1 / -0

For Zn²⁺/Zn = - 0.76 V, Cl₂/Cl^- = 1.36 V, H⁺/1/2H₂ = 0 V and Fe³⁺/Fe²⁺ = 0.77 V, the increasing order of strengths as a reducing agent is

A
Cl^-, Zn, H₂, Fe³⁺

B
H₂, Zn, Fe³⁺, Cl^-

C
Cl^-, Fe³⁺, Zn, H₂

D
Cl^-, Fe³⁺, H₂, Zn

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Redox Reactions Test - 3

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Redox Reactions Test - 3

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Question 1

disproportionation reactions

displacement reactions

decomposition reactions

Combination reaction

Solution

Question 2

Sn2+

Sn4+

As

HAsO2

Question 3

125

1250

200

20

Question 4

NaBr + HCl → NaCl + HBr

HBr + AgNO3 → AgBr + HNO3

H2 + Br2 → 2HBr

Na2O + H2SO4 → Na2SO4 + H2O

Question 5

4

1

-2

-3

Solution

Question 6

32 g

64 g

16 g

8 g

Question 7

In alkaline earth metals

the first three groups

across the third period in the periodic table

in the atoms of transition elements

Solution

Question 8

Cl-, Zn, H2, Fe3+

H2, Zn, Fe3+, Cl-

Cl-, Fe3+, Zn, H2

Cl-, Fe3+, H2, Zn

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Sn²⁺

Sn⁴⁺

HAsO₂

HBr + AgNO₃ → AgBr + HNO₃

H₂ + Br₂ → 2HBr

Na₂O + H₂SO₄ → Na₂SO₄ + H₂O

Cl^-, Zn, H₂, Fe³⁺

H₂, Zn, Fe³⁺, Cl^-

Cl^-, Fe³⁺, Zn, H₂

Cl^-, Fe³⁺, H₂, Zn