H 2 O 2 is prepared in the laboratory by the reaction of :

BaO 2 and CO 2 bubbling through cold water

MnO 2 with dilute cold H 2 SO 4

PbO 2 with an acidified solution of KMnO 4

Which conversion is not done by H 2 O 2 ?

Fe + → Fe 3 + (alkaline medium)

Fe 2 + → Fe 3 + (acidic medium)

Chemistry - Hydrogen - Quiz-2

The metal that does not displace hydrogen from an acid is:

0%

Hg
0%

Zn
0%

Al
0%

Ca

The catalyst used in Bosch process of manufacture of H₂ is:

0%

finely divided Ni
0%

V₂O₅
0%

Pd
0%

Fe₂O₃ + Cr₂O₃

An aqueous solution of hydrogen peroxide is:

0%

alkaline
0%

neutral
0%

strongly acidic
0%

weakly acidic

The correct statement among the following regarding perhydrol is -

0%

It is 30% H₂O₂ or 100 vol. H₂O₂
0%

Its molarity is 8.8 M
0%

It is used as an antiseptic and a germicide
0%

All of the above

The ortho and para hydrogen possess:

0%

same physical properties but different chemical properties
0%

different physical properties but same chemical properties
0%

same chemical and physical properties
0%

different physical and chemical properties

On bubbling CO₂ through a solution of barium peroxide in water:

0%

O₂ is formed
0%

H₂CO₃ is formed
0%

H₂O₂ is formed
0%

H₂ is formed

A mixture of hydrazine and 60 to 90 percent of H₂O₂ solution is:

0%

antiseptic
0%

rocket fuel
0%

germicide
0%

insecticide

Temporary hardness is caused due to the presence of:

0%

CaSO₄
0%

CaCl₂
0%

CaCO₃
0%

Ca(HCO₃)₂

H₂O₂ is prepared in the laboratory by the reaction of :

0%

MnO₂ with dilute cold H₂SO₄
0%

BaO₂ and CO₂ bubbling through cold water
0%

PbO₂ with an acidified solution of KMnO₄
0%

Na₂O₂ with boiling water

A 1000 g aqueous solution of CaCO₃ contains 10 g of calcium carbonate. The hardness of the solution is:

0%

10 ppm
0%

100 pm
0%

1000 ppm
0%

10000 ppm

Hydrogen adsorbed on palladium is known as:

0%

Atomic H
0%

Nascent H
0%

Occluded H
0%

Heavy H

A compound that acts as both reducing and oxidising agent is-

0%

H₂SO₄
0%

H₂O₂
0%

KOH
0%

KMnO₄

A given solution of H₂O₂ is 30 volume. Its concentration in terms of molarity is:

0%

9.1 M
0%

2.68 M
0%

2.5 M
0%

26.8 M

Decomposition of H₂O₂ is accelerated by:

0%

traces of acids
0%

finely divided metals
0%

acetanilide
0%

alcohol

Hardness of water cannot be removed by -

0%

Clark's method
0%

Adding washing soda
0%

Calgon process
0%

Filtration

In which reaction hydrogen is not formed ?

0%

Copper and hydrochloric acid
0%

Iron and sulphuric acid
0%

Magnesium and steam
0%

Sodium and alcohol

Poorest reducing agent among following is

0%

atomic hydrogen
0%

nascent hydrogen
0%

dihydrogen
0%

all have same reducing strength

Which conversion is not done by H₂O₂ ?

0%

${Fe}^{2 +} \overset{}{\to} {Fe}^{3 +}$ (acidic medium)
0%

$PbS \overset{}{\to} {PbSO}_{4}$
0%

${Fe}^{+} \overset{}{\to} {Fe}^{3 +}$ (alkaline medium)
0%

$KI \overset{}{\to} I_{2}$

H₂O₂ restores the colour of old lead paintings by:

0%

Converting PbO₂ to Pb
0%

Oxidising PbS to PbSO₄
0%

Converting PbCO₃ to Pb
0%

Oxidizing PbSO₃ to PbSO₄

(I) $H_{2} O_{2} + O_{3} \overset{}{\to} H_{2} O + 2 O_{2}$

(II) $H_{2} O_{2} + {Ag}_{2} O \overset{}{\to} 2 Ag + H_{2} O + O_{2}$

Role of hydrogen peroxide in the above reactions is respectively

0%

oxidising in (I) and reducing in (II)
0%

reducing in (I) and oxidising in (II)
0%

reducing in (I) and (II)
0%

oxidising in(I) and (II)

In acidic medium, H₂O₂ changes ${Cr}_{2} O_{7}^{2 -}$ to CrO₅ which has two (-O-O-) bonds. Oxidation

state of Cr in CrO₅ is

0%

+5
0%

+3
0%

+6
0%

-10

Maximum concentration of ortho- $H_{2}$ in ordinary hydrogen is:

0%

75% ortho- $H_{2}$ + 25% para- $H_{2}$
0%

25% ortho- $H_{2}$ + 75% para- $H_{2}$
0%

50% ortho- $H_{2}$ + 50% para- $H_{2}$
0%

99% para- $H_{2}$ + 1% ortho- $H_{2}$

Hydrogen will not reduce $-$

0%

heated cupric oxide
0%

heated ferric oxide
0%

heated stannic oxide
0%

heated aluminium oxide

A substance gives off $O_{2}$ when heated, turns an acid solution of $KI$ violet, and reduces acidified ${KMnO}_{4}$ . The substance is –

0%

${SO}_{3}$
0%

${KNO}_{3}$
0%

$H_{2} O_{2}$
0%

All of these

The first ionization energy value $(kJ {mol}^{- 1})$ for $H, Li, F, and Na$

is given below but not in a correct order

$1681, 520, 1312, 495 .$

The ionization energy value of H would be -

0%

1681
0%

1312
0%

520
0%

485

The hydrides ion $H^{-}$ is a stronger base than its hydroxide ion ${OH}^{-}$ . Which of the following reactions will occur if sodium hydride $(NaH)$ is dissolved in water –

0%

(A) H-aq+H2O→H3O-aq
0%

(B)&nsp; $H^{-} (aq) + H_{2} O (l) \to {OH}^{-} (aq) + H_{2} (g)$
0%

(C) $H^{-} (aq) + H_{2} O (l) \to No reaction$
0%

(D) $None of these$

Blackened oil planting can be restored into original form by the action of:

0%

Chlorine
0%

${BaO}_{2}$
0%

$H_{2} O_{2}$
0%

${MnO}_{2}$

Which of the following statement regarding $H_{2} O_{2}$ is wrong.

0%

It is stable in acid medium
0%

It acts as oxidising as well as reducing agent
0%

It has zero dipole moment
0%

Pure $H_{2} O_{2}$ is slightly acidic

Polyphosphates are used as water softening agents because they –

0%

form soluble complexes with anionic species
0%

precipitate anionic species
0%

form soluble complexes with cationic species
0%

precipitate cationic species

Permanent hardness of water can be removed, by adding –

0%

Soda lime
0%

Sodium bicarbonate
0%

Washing soda
0%

Sodium chloride

0:0:1

Practice Chemistry Quiz Questions and Answers

0:0:1

Practice Chemistry Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.