The p-Block Elements Test

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The p-Block Elements Test - 66

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Weekly Quiz Competition

Question 1
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Which of the following is the correct statement about silicones?

A
They are made up of $$SiO_4^{4-}$$ units.

B
They are polymers made up of $$R_2SiO$$ units.

C
They are water soluble compounds.

D
They are hydrophillic in nature.

Solution

Answer:- (B) They are polymers made up of $${({R}_{2}Si{O})}_{n}$$ units.
Silicones are polymers which contains $${({R}_{2}Si{O})}_n$$ chains, where R is any alkyl or phenyl group, present with each silicon atom. They are hydrophobic in nature.
Question 2
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Under hydrolytic condition, the compounds used for preparation of linear polymer and for chain termination, respectively, are:

A
$$CH_3SiCl_3$$ and $$Si(CH_3)_4$$

B
$$(CH_3)_2SiCl_2$$ and $$(CH_3)_3SiCl$$

C
$$(CH_3)_2SiCl_2$$ and $$CH_3SiCl_3$$

D
$$SiCl_4$$ and $$(CH_3)_3SiCl$$

Solution

Answer:- $${(C{H}_{3})}_{2}Si{Cl}_{2}$$ and $${(C{H}_{3})}_{3}SiCl$$
Under hydrolytic conditions, the compound used for the preparation of linear polymer and for chain termination are $${(C{H}_{3})}_{2}Si{Cl}_{2}$$ and $$ {(C{H}_{3})}_{3}SiCl$$ respectively.
The hydrolysis of dimethyldichlorosilane produces dimethyl silane diol which on condensation polymerization forms a linear polymer.
The hydrolysis of trimethylchlorosilane produces trimethyl silanol which cannot undergo polymerization as it contains only one -OH group. Hence, it is used for chain termination.
Question 3
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What happens when silicon is heated with methyl chloride in presence of copper as a catalyst at 573K?

A
Methyl substituted chlorosilanes are formed

B
Only $$Me_4$$ Si is formed

C
Polymerised chains of $$(CH_3)_3SiCl$$ are formed

D
Silicones are formed

Solution

Heating of Silicon with methyl chloride at high temperature in the Presence of copper produces a mixture of mono, di and tri methylchlorosilanes and tetramethylsilane.

$$C{H}_{3}Cl + Si \; \xrightarrow[570 \; K]{\text{Cu Powder}} \; C{H}_{3}Si{Cl}_{3} + {(C{H}_{3})}_{2}Si{Cl}_{2} + {(C{H}_{3})}_{3}SiCl + {(C{H}_{3})}_{4}Si$$

Methyl substituted chlorosilanes are formed.

Hence, the correct answer is option $$\text{A}$$.
Question 4
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Which of the following compounds have zero dipole moment ?

A
$$BF_3$$

B
$$SnCl_2$$

C
$$H_2O$$

D
$$NH_3$$

Solution
Question 5
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Which order of boiling point is correct?

A
$$He < Ne < Ar < O_{2} < N_{2}$$

B
$$He < Ne < N_{2} < Ar < O_{2}$$

C
$$He < Ne < N_{2} < O_{2} < Ar$$

D
$$He < Ar < N_{2} < Ne < O_{2}$$
Question 6
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Quartz is an example of:

A
Chain Silicate

B
Sheet Silicate

C
Cyclic Silicate

D
3D netweo Silicate

Solution

Silicate minerals are the most common of Earth's minerals and include, quartz, feldspar, mica, amphibole, pyroxene, and olivine.It is made up of sheet silicates.
Question 7
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How many derivate structures of $${B}_{3}{N}_{3}{H}_{4}{X}_{2}$$ can be derived from the basic structure by the replacement of two hydrogen atoms?

A
$$2$$

B
$$3$$

C
$$4$$

D
$$5$$

Solution

Hence four structures are possible.
Question 8
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Diborane on reaction with oxygen gives a boron compound A.'A' can also be obtained by strongly heating:

A
$${ H }_{ 2 }{ BO }_{ 2 }$$

B
$${ BCl }_{ 3 }$$

C
$${ NaBH }_{ 4 }$$

D
$${ B }_{ 3 }{ N }_{ 3 }{ H }_{ 6 }$$

Solution
Question 9
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In silicon dioxide

A
there are double bonds between silicon and oxygen atoms

B
silicon atom is bonded to two oxygen atoms

C
each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

D
each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms.

Solution

$$SiO_2$$ is a a 3D network solid in which each silicon atom is surrounded by 4 oxygen atoms, and each oxygen atoms is surrounded by two silicon atoms.
Question 10
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Super conductors are derived from compounds of:

A
p-block elements

B
lanthanides

C
actinides

D
transition elements