The p-Block Elements Test

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The p-Block Elements Test - 42

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Weekly Quiz Competition

Question 1
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Industrial preparations of $$HN{ O }_{ 3 }$$ by Ostwald's process involves:

A
reduction of $$N{ H }_{ 3 }$$

B
oxidation of $$N{ H }_{ 3 }$$

C
hydrogenation of $$N{ H }_{ 3 }$$

D
hydrolysis of $$N{ H }_{ 3 }$$

Solution

Ammonia is converted to nitric acid in 2 stages. It is oxidized by heating with oxygen in the presence of a catalyst such as platinum with 10% rhodium, to form nitric oxide and water. This reaction is strongly exothermic, making it a useful heat source once initiated.
Stage two encompasses two reactions and is carried out in an absorption apparatus containing water. Initially nitric oxide is oxidized again to yield nitrogen dioxide. This gas is then readily absorbed by the water, yielding the desired product (nitric acid, albeit in a dilute form), while reducing a portion of it back to nitric oxide.
Hence, industrial preparations of $$ { HNO }_{ 3 } $$ by Ostwald's process involves oxidation of $$ NH_{ 3 } $$.
Question 2
1 / -0

Which of the following compounds do not give ammonia on reaction with water?

A
$${ Mg }_{ 3 }{ N }_{ 2 }$$

B
$$AlN$$

C
$$CaC{ N }_{ 2 }$$

D
$$Ca{ \left( CN \right) }_{ 2 }$$

Solution

$$\text{Let's see, what happens:}$$
$$\text{when the given, compounds react with water}$$
$$\mathrm{Mg}_{2}\mathrm{~N}_{2}+6\mathrm{H}_{2}\mathrm{O}\longrightarrow 2 \mathrm{Mg}(\mathrm{OH})_{2}+2 \mathrm{NH}_{3}$$
$$AlN+3\mathrm{H}_{2}\mathrm{O}\longrightarrow\mathrm{NH}_{3}+\mathrm{Al}(\mathrm{OH})_{3}$$
$$\begin{array}{l}\mathrm{Ca}(\mathrm{CN})_{2}+2\mathrm{H}_{2}\mathrm{O} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}+2\mathrm{HCN}\\\mathrm{CaCN}_{2}+3\mathrm{H}_{2}\mathrm{O} \longrightarrow \mathrm{CaCO}_{3}+2 \mathrm{NH}_{3}\end{array}$$

$$\begin{array}{l}\text { Herce, only } \mathrm{Ca}(\mathrm{CN})_{2}\text { doesn't give } \mathrm{NH}_{3} \text { , on reaction with water. } \\\qquad \text { So, option(D) is correct. }\end{array}$$
Question 3
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Chlorine reacts with hot turpentine to form:

A
carbon and hydrogen

B
carbon and hydrogen chloride

C
methane and sulphur

D
carbon dioxide and hydrogen chloride

Solution

Chlorine reacts with hot turpentine to form carbon and hydrogen.
$$\displaystyle C_{10}H_{16} +8Cl_2 \rightarrow 16HCl+10C$$
Question 4
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__________ is a greenish yellow gas having an irritating choking and unpleasant odour.

A
Fluorine

B
Bromine

C
Chlorine

D
Hydrogen sulphide

Solution

Chlorine is a greenish yellow gas that is highly toxic. Poisoning by chlorine gas causes severe respiratory problems that lead to difficulty in breathing and even death.
Question 5
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Dry chlorine is not collected over mercury because:

A
of formation of mercuric chloride

B
of formation of amalgams

C
it is soluble in mercury

D
it is heavier than mercury

Solution

Dry chlorine is not collected over mercury because it reacts with it to form mercuric chloride.
$$\displaystyle Hg+Cl_2\rightarrow HgCl_2$$
Question 6
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Which of the following are crystalline allotropic forms of sulphur?

A
Sulphur is used in preparation of conducting wires

B
A mixture of zinc and sulphur on heating with sulphur produces a greyish residue of zinc sulphide

C
Sulphur is an element belonging to VI A group

D
Sulphur is a nonmetallic element

Solution

Due to its crystalline structure, sulphur is used in preparation of conducting wires. The crystal form of structure facilitates conducting wires. The crystal form of structures facilitates conduction process.
Question 7
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Which one of the following equation indicates the common laboratory method for the preparation of chlorine?

A
$$4HCl\ +\ { O }_{ 2 }\ \longrightarrow \ 2{ H }_{ 2 }O\ +\ 2{ Cl }_{ 2 }$$

B
$$2NaCl\ +\ 2{ H }_{ 2 }O\quad \longrightarrow \ 2NaOH\ +\ { H }_{ 2 }\ +\ { Cl }_{ 2 }$$

C
$$2{ Mg }_{ 2 }OCl\ +\ { O }_{ 2 }\ \longrightarrow \ 4MgO\ +\ { Cl }_{ 2 }$$

D
$$Mn{ O }_{ 2 }\ +\ 4HCl\ \longrightarrow \ Mn{ Cl }_{ 2 }\ +2{ H }_{ 2 }O\ +\ { Cl }_{ 2 }$$

Solution

Chlorine is commonly prepared in the laboratory by reacting manganese dioxide with aqueous hydrochloric acid.
$$MnO_2 + 4HCl \rightarrow MnCl_2 + 2H_2O + Cl_2$$
Question 8
1 / -0

Which of the following is not the allotropic form of sulphur?

A
Roll sulphur

B
Monoclinic sulphur

C
Plastic sulphur

D
Rhombic sulphur

Solution

Roll sulphur is not the allotropic form of sulphur.
Monoclinic sulphur, Plastic sulphur and Rhombic sulphur are the allotropic form of sulphur.
Question 9
1 / -0

Sodium thiosulphate is used in:

A
photography

B
medicines

C
explosive industry

D
match industry

Solution

Sodium thiosulphate is used in photography as a fixer. It forms a complex with silver halide used in photographic paper.
Question 10
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Which is true regarding nitrogen?

A
Less electronegative

B
Has low ionisation enthalpy

C
d-orbitals are available

D
Ability to form $$p\pi -p\pi$$ bonds with itself

Solution

p-pi-p-pi bond is when bonding occurs in elements having their vacant place and vacant electron in the p orbital. Example: Nitrogen (N$$_2$$)

Hence, the correct option is $$D$$

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The p-Block Elements Test - 42

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The p-Block Elements Test - 42

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SHARING IS CARING

Question 1

reduction of $$N{ H }_{ 3 }$$

oxidation of $$N{ H }_{ 3 }$$

hydrogenation of $$N{ H }_{ 3 }$$

hydrolysis of $$N{ H }_{ 3 }$$

Solution

Question 2

$${ Mg }_{ 3 }{ N }_{ 2 }$$

$$AlN$$

$$CaC{ N }_{ 2 }$$

$$Ca{ \left( CN \right) }_{ 2 }$$

Solution

Question 3

carbon and hydrogen

carbon and hydrogen chloride

methane and sulphur

carbon dioxide and hydrogen chloride

Solution

Question 4

Fluorine

Bromine

Chlorine

Hydrogen sulphide

Solution

Question 5

of formation of mercuric chloride

of formation of amalgams

it is soluble in mercury

it is heavier than mercury

Solution

Question 6

Sulphur is used in preparation of conducting wires

A mixture of zinc and sulphur on heating with sulphur produces a greyish residue of zinc sulphide

Sulphur is an element belonging to VI A group

Sulphur is a nonmetallic element

Solution

Question 7

$$4HCl\ +\ { O }_{ 2 }\ \longrightarrow \ 2{ H }_{ 2 }O\ +\ 2{ Cl }_{ 2 }$$

$$2NaCl\ +\ 2{ H }_{ 2 }O\quad \longrightarrow \ 2NaOH\ +\ { H }_{ 2 }\ +\ { Cl }_{ 2 }$$

$$2{ Mg }_{ 2 }OCl\ +\ { O }_{ 2 }\ \longrightarrow \ 4MgO\ +\ { Cl }_{ 2 }$$

$$Mn{ O }_{ 2 }\ +\ 4HCl\ \longrightarrow \ Mn{ Cl }_{ 2 }\ +2{ H }_{ 2 }O\ +\ { Cl }_{ 2 }$$

Solution

Question 8

Roll sulphur

Monoclinic sulphur

Plastic sulphur

Rhombic sulphur

Solution

Question 9

photography

medicines

explosive industry

match industry

Solution

Question 10

Less electronegative

Has low ionisation enthalpy

d-orbitals are available

Ability to form $$p\pi -p\pi$$ bonds with itself

Solution

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