Hydrogen Test

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Hydrogen Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Hydrogen peroxide is used as an antiseptic under the name

A
bleaching powder

B
perhydrol

C
Nessler's reagent

D
catechol

Solution

30% of weight by volume (w/v) hydrogen peroxide or 100 volume strength hydrogen peroxide is perhydrol. Hydrogen peroxide is used as an antiseptic and anti-bacterial agent.
Question 2
1 / -0

The strength of 20 volume H₂O₂ is

A
13.6 g/l

B
60.7 g/l

C
160 g/l

D
20.2 g/l

Solution

2H₂O₂ → 2H₂O + O₂
2 x 34 = 68
22.4 L at N.T.P.
22.4 L of O₂ at N.T.P. is produced from 68 g of H₂O₂
20 L of O₂ at N.T.P. is produced from 68 x 20 / 22.4 = 60.7 g of H₂O₂
Therefore, strength of H₂O₂ in 20 volume H₂O₂ = 60.7 g/L
Question 3
1 / -0

Which of the following equations depicts the reducing nature of H₂O₂?

A
2[Fe(CN)₆]^4- + 2H⁺ + H₂O₂ → 2[Fe(CN)₆]₃^- + 2H₂O

B
I₂ + H₂O₂ + 2OH^- → 2I^- + 2H₂O + O₂

C
Mn²⁺ + H₂O₂ → Mn⁴⁺ + 2OH^-

D
PbS + 4H₂O₂ → PbSO₄ + 4H₂O

Solution

In equation (2), H₂O₂ is acting as a reducing agent.
Question 4
1 / -0

The oxidation states of most electronegative elements in the products of the reaction of BaO₂ with dil. H₂SO₄, are

A
0 and -1

B
-1 and -2

C
-2 and 0

D
-2 and +1

Solution

BaO₂ + H₂SO₄ → BaSO₄ + H₂O₂
Oxidation state of O in BaSO₄ = -2
Oxidation state of O in H₂O₂ = -1
Question 5
1 / -0

Hydrogen resembles halogens in many respects for which several factors are responsible. Which of the following factors is the most important in this respect?

A
Its tendency to lose an electron to form a cation

B
Its tendency to gain a single electron in its valence shell to attain stable electronic configuration

C
Its low negative electron gain enthalpy value

D
Its small size

Solution

Hydrogen resembles halogens in many respects but the most important is that both hydrogen and halogens require one electron to complete their valence shell or to attain a stable electronic configuration.
Question 6
1 / -0

One mole of calcium phosphide on reaction with excess of water gives

A
one mole of phosphine

B
two moles of phosphoric acid

C
two moles of phosphine

D
one mole of phosphorus pentoxide

Solution

Ca₃P₂ + 6H₂O → 3Ca(OH)₂ + 2PH₃
1 mol 2 mol
Question 7
1 / -0

Polyphosphates are used as water softening agents because they

A
form soluble complexes with anionic species

B
precipitate anionic species

C
form soluble complexes with cationic species

D
precipitate cationic species

Solution

Polyphosphates, such as sodium hexametaphosphate, combine with cations (Ca²⁺ or Mg²⁺) to form soluble complex:

2Ca²⁺ + Na₂[Na₄(PO₃)₆] → 4Na⁺ + Na₂[Ca₂(PO₃)₆]
Question 8
1 / -0

The reagent commonly used to determine the hardness of water titrimetrically is

A
oxalic acid

B
disodium salt of EDTA

C
sodium citrate

D
sodium thiosulphate

Solution

The reagent commonly used to determine hardness of water titrimetrically is disodium salt of EDTA.
Question 9
1 / -0

One mole of magnesium nitride on reaction with excess of water gives

A
one mole of ammonia

B
one mole of nitric acid

C
two moles of ammonia

D
two moles of nitric acid

Solution

Mg₃N₂ + 3H₂O → 2NH₃ + 3MgO
Question 10
1 / -0

Very pure hydrogen (99.9%) can be made by which of the following processes?

A
Mixing natural hydrocarbons of high molecular weight

B
Reaction of salt-like hydrides with water

C
Electrolysis of water

D
Reaction of methane with steam

Solution

Highly pure hydrogen is obtained by the electrolysis of water. Electrolysis of water is the decomposition of water (H₂O) into oxygen (O₂) and hydrogen gas (H₂) due to an electric current being passed through the water.

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Hydrogen Test - 6

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Hydrogen Test - 6

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Question 1

bleaching powder

perhydrol

Nessler's reagent

catechol

Solution

Question 2

13.6 g/l

60.7 g/l

160 g/l

20.2 g/l

Solution

Question 3

2[Fe(CN)6]4- + 2H+ + H2O2 → 2[Fe(CN)6]3- + 2H2O

I2 + H2O2 + 2OH- → 2I- + 2H2O + O2

Mn2+ + H2O2 → Mn4+ + 2OH-

PbS + 4H2O2 → PbSO4 + 4H2O

Solution

Question 4

0 and -1

-1 and -2

-2 and 0

-2 and +1

Solution

Question 5

Its tendency to lose an electron to form a cation

Its tendency to gain a single electron in its valence shell to attain stable electronic configuration

Its low negative electron gain enthalpy value

Its small size

Solution

Question 6

one mole of phosphine

two moles of phosphoric acid

two moles of phosphine

one mole of phosphorus pentoxide

Solution

Question 7

form soluble complexes with anionic species

precipitate anionic species

form soluble complexes with cationic species

precipitate cationic species

Solution

Question 8

oxalic acid

disodium salt of EDTA

sodium citrate

sodium thiosulphate

Solution

Question 9

one mole of ammonia

one mole of nitric acid

two moles of ammonia

two moles of nitric acid

Solution

Question 10

Mixing natural hydrocarbons of high molecular weight

Reaction of salt-like hydrides with water

Electrolysis of water

Reaction of methane with steam

Solution

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2[Fe(CN)₆]^4- + 2H⁺ + H₂O₂ → 2[Fe(CN)₆]₃^- + 2H₂O

I₂ + H₂O₂ + 2OH^- → 2I^- + 2H₂O + O₂

Mn²⁺ + H₂O₂ → Mn⁴⁺ + 2OH^-

PbS + 4H₂O₂ → PbSO₄ + 4H₂O