Hydrogen Test

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Hydrogen Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

How does H₂O₂react when it is added to a solution of KMnO₄ and a solution of KI, respectively?

A
It acts as an oxidising agent in both the reactions.

B
It acts as a reducing agent in both the reactions.

C
It acts as a reducing agent in the reaction with KMnO₄ and oxidising agent in that with KI.

D
It acts as an oxidising agent in the reaction with KMnO₄ and reducing agent in that with KI.

Solution

H₂O₂acts as a reducing agent and an oxidising agent when it is added to a solution of KMnO₄and a solution of KI, respectively.

As a reducing agent:
2KMnO₄ + 5H₂O₂+ 3H₂SO₄ → K₂SO₄ + 5O₂ + 2MnSO₄ + 8H₂O

As an oxidising agent:
3KI + H₂O₂ + H₂SO₄ → KI₃ + K₂SO₄ + 2H₂O
Question 2
1 / -0

H₂O₂is not used

A
as an antiseptic

B
as a bleaching agent

C
as an oxidizing agent

D
in the manufacture of heavy mater

Solution

H₂O₂ is not used in the manufacture of heavy mater.
Question 3
1 / -0

In acidic medium, H₂O₂acts as a reducing agent on reaction with

A
Ag₂O

B
acidified KMnO₄

C
O₃

D
None of these

Solution

In acidic medium, H₂O₂acts as a reducing agent on reaction with acidified KMnO₄
Question 4
1 / -0

Which of the following does not give H₂O₂on hydrolysis?

A
H₂SO₅

B
H₂S₂O₈

C
HCIO₄

D
H₄P₂O₈

Solution

Perchloric Acid is not susceptible to hydrolysis.
Question 5
1 / -0

Which of the following metal oxides does not produce H₂O₂on treatment with acid?

A
BaO₂

B
K₂O₂

C
PbO₂

D
ZnO₂

Solution

PbO₂produce H₂O₂on treatment with acid.
Question 6
1 / -0

For the laboratory preparation of H₂O₂,

A
MnO₂ is added to dilute cold H₂SO₄

B
BaO₂ is added to ice cold solution of sulphuric acid

C
PbO₂is added to an acidified solution

D
Na₂O₂ is added to boiling water

Solution

For the laboratory preparation of H₂O₂, BaO₂ is added to ice cold solution of sulphuric acid.

BaO₂ + H₂SO₄ → BaSO₄ + H₂O₂
Question 7
1 / -0

The percentage by weight, of hydrogen in hydrogen peroxide is

A
50

B
25

C
5.88

D
6.25

Solution

The percentage by weight, of hydrogen in hydrogen peroxide is 5.88.
Question 8
1 / -0

The substance which reduces the speed of decomposition of hydrogen peroxide is

A
Na₂CO₃

B
NaOH

C
Pt

D
alcohol

Solution

Hydrogen peroxide turns a black substance white. The black substance is PbS
Question 9
1 / -0

Hydrogen peroxide turns a black substance white. The black substance is

A
HgS

B
PbS

C
NiS

D
any of the above

Solution

The black substance is PbS. Black lead sulphide is oxidised to white lead sulphate:

PbS + 4H₂O₂ → PbSO₄ + 4H₂O
Question 10
1 / -0

Bleaching action of H₂O₂is due to its

A
reducing property

B
oxidising property

C
acidic nature

D
thermal unstability

Solution

With its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent.

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Hydrogen Test - 4

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Hydrogen Test - 4

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Question 1

It acts as an oxidising agent in both the reactions.

It acts as a reducing agent in both the reactions.

It acts as a reducing agent in the reaction with KMnO4 and oxidising agent in that with KI.

It acts as an oxidising agent in the reaction with KMnO4 and reducing agent in that with KI.

Solution

Question 2

as an antiseptic

as a bleaching agent

as an oxidizing agent

in the manufacture of heavy mater

Solution

Question 3

Ag2O

acidified KMnO4

O3

None of these

Solution

Question 4

H2SO5

H2S2O8

HCIO4

H4P2O8

Solution

Question 5

BaO2

K2O2

PbO2

ZnO2

Solution

Question 6

MnO2 is added to dilute cold H2SO4

BaO2 is added to ice cold solution of sulphuric acid

PbO2 is added to an acidified solution

Na2O2 is added to boiling water

Solution

Question 7

50

25

5.88

6.25

Solution

Question 8

Na2CO3

NaOH

Pt

alcohol

Solution

Question 9

HgS

PbS

NiS

any of the above

Solution

Question 10

reducing property

oxidising property

acidic nature

thermal unstability

Solution

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It acts as a reducing agent in the reaction with KMnO₄ and oxidising agent in that with KI.

It acts as an oxidising agent in the reaction with KMnO₄ and reducing agent in that with KI.

Ag₂O

acidified KMnO₄

O₃

H₂SO₅

H₂S₂O₈

HCIO₄

H₄P₂O₈

BaO₂

K₂O₂

PbO₂

ZnO₂

MnO₂ is added to dilute cold H₂SO₄

BaO₂ is added to ice cold solution of sulphuric acid

PbO₂is added to an acidified solution

Na₂O₂ is added to boiling water

Na₂CO₃