The p-Block Elements Test

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The p-Block Elements Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Among the following which is the strongest oxidizing agent?

A
I₂

B
F₂

C
Br₂

D
Cl₂

Solution

F₂ is most electronegative element hence it readily get reduced to F^- ion so it is very strong oxidizing agent.
Question 2
1 / -0

One mole of magnesium nitride on the reaction with an excess of water gives:

A
one mole of ammonia

B
two moles of ammonia

C
one mole of nitric acid

D
two moles of nitric acid

Solution

Mg₃N₂ + 6H₂O = 3Mg(OH)₂ + 2NH₃
Question 3
1 / -0

Which of the following statements is not valid for oxoacids of phosphorus?

A
Hypophosphorous acid is a diprotic acid

B
Orthophosphoric acid is used in the manufacture of triple superphosphate

C
All oxoacids contain at least one P = O unit and one P – OH group

D
All oxoacids contain tetrahedral four coordinated phosphorus

Solution

Hypophosphorous acid is a phosphorus oxoacid and a powerful reducing agent with molecular formula H₃PO₂. Inorganic chemists refer to the free acid by this name (also as "HPA"), or the acceptable name of phosphinic acid. It is a colorless, Monoprotic low-melting compound, which is soluble in water, dioxane, and alcohols.
Question 4
1 / -0

Sulphur trioxide can be obtained by which of the following reaction

A
CCaSO₄+ C → Δ

B
FeSO₄→ Δ

C
S + H2SO₄ → Δ

D
H₂SO₄ + PCl₃ → Δ

Solution

Thermal decomposition of FeSO₄ produces the following products

2FeSO₄→ Fe₂O₃ + SO₂ + SO₃
Question 5
1 / -0

Argon is used

A
To obtain low temperature

B
In high temperature welding

C
In filling airships

D
In radio therapy for treatment of cancer

Solution

Ar is used in high temperature welding to provide inert atmosphere.
Question 6
1 / -0

The function of Fe (OH)₃ in the contact process is

A
to detect colloidal impurity

B
to remove moisture

C
to remove arsenic impurity

D
to remove dust particles

Solution

Fe(OH)₃ is used to remove arsenic impurities.
Question 7
1 / -0

Of the following compounds the most acidic is

A
As₂O₃

B
Sb₂O₃

C
P₂O₅

D
Bi₂O₃

Solution

More is the oxidation number greater is the acidity of the oxide. Here P is in +5 oxidation state.
Question 8
1 / -0

Atoms in a P₄ molecule of white phosphorus are arranged regularly in the following way

A
at the centre and corners of a tetrahedron

B
at the corners of the octahedron

C
at the corners of a tetrahedron

D
at the corners of the cube

Solution

in P₄ four P atoms are arranged at the corners of tetrahedron (tetrahedral structure).

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The p-Block Elements Test - 8

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Question 1

I2

F2

Br2

Cl2

Solution

Question 2

one mole of ammonia

two moles of ammonia

one mole of nitric acid

two moles of nitric acid

Solution

Question 3

Hypophosphorous acid is a diprotic acid

Orthophosphoric acid is used in the manufacture of triple superphosphate

All oxoacids contain at least one P = O unit and one P – OH group

All oxoacids contain tetrahedral four coordinated phosphorus

Solution

Question 4

CCaSO4+ C → Δ

FeSO4→ Δ

S + H2SO4 → Δ

H2SO4 + PCl3 → Δ

Solution

Question 5

To obtain low temperature

In high temperature welding

In filling airships

In radio therapy for treatment of cancer

Solution

Question 6

to detect colloidal impurity

to remove moisture

to remove arsenic impurity

to remove dust particles

Solution

Question 7

As2O3

Sb2O3

P2O5

Bi2O3

Solution

Question 8

at the centre and corners of a tetrahedron

at the corners of the octahedron

at the corners of a tetrahedron

at the corners of the cube

Solution

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I₂

F₂

Br₂

Cl₂

CCaSO₄+ C → Δ

FeSO₄→ Δ

S + H2SO₄ → Δ

H₂SO₄ + PCl₃ → Δ

As₂O₃

Sb₂O₃

P₂O₅

Bi₂O₃