The p-Block Elements Test

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The p-Block Elements Test - 25

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Weekly Quiz Competition

Question 1
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Borax is actually made of two tetrahedral and two triangular units joined together and should be written as: $$\displaystyle Na_{2}[B_{4}O_{5}(OH)_{4}]\cdot 8H_{2}$$O
Consider the following statements about borax. Which of the following is the correct statement?

A
Each boron atom has four $$B-O$$ bonds

B
Each boron atom has three $$B-O$$ bonds while other two have three $$B-O$$ bonds

C
Each boron atom has four $$B-O$$ bonds while other two have three $$B-O$$ bonds

D
Each boron atom has one $$-OH$$ groups

Solution
Question 2
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If we start with $$MeSiCl_{3}$$ as the starting material, silicones formed is :

A

B

C
both of the above

D
none of the above

Solution

The silicone obtained from $$MeSiCl_{3}$$ will have the structure as represented by option B.
The repeating unit is $$MeSiO_3$$.
Question 3
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$$RCl \displaystyle \xrightarrow[Si]{cu-powder} R_{2}SiCl_{2} \xrightarrow{H_{2}O} R_{2}Si\left ( OH \right )_{2} \xrightarrow{condensation} A$$
Compound ( A ) is :

A
a linear silicone

B
a chlorosilane

C
a linear silane

D
a network silane

Solution

The hydrolysis of $${ R }_{ 2 }{ SiCl }_{ 2 }$$ will give dialkyl silanediol which on polymerization will give a linear polymer.
$$RCl \displaystyle \xrightarrow[Si]{Cu-powder} R_{2}SiCl_{2} \xrightarrow{H_{2}O} R_{2}Si\left ( OH \right )_{2} \xrightarrow{condensation} \underset {A,\ linear \ polymer} {-O-R_2Si-O-R_2Si-O-R_2Si-O-}$$
Compound (A) is a linear silicone.
Question 4
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An inorganic compound (A) made of two most occurring elements into the earth crust, having a polymeric tetrahedral network structure. With carbon, compound (A) produces a poisonous gas (B) which is the most stable diatomic molecule. Compounds (A) and (B) will be :

A
$$SiO_{2},CO_{2}$$

B
$$SiO_{2},CO$$

C
$$SiC,CO$$

D
$$SiO_{2},N_{2}$$

Solution

$$SiO_2 + 2C \rightarrow Si + 2CO$$
Compound A is silica ($$SiO_2$$) made of $$Si$$ and $$O_2$$, two most occuring elements into the earth crust, having a polymeric tetraheadral network structure.
Compound B is $$CO$$, a poisonous gas which is the most stable diatomic molecule.
Question 5
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Select correct statement:

A
Oxides of carbon family $$(MO_2)$$ are all network solids with octahedral coordination.

B
silicon dioxide(silica) is a network solid with tetrahedral coordination and is a giant molecule.

C
$$GeO_2, SnO_2$$ and $$PbO_2$$ are all acidic oxides.

D
None of the above.

Solution

Silica has a three-dimensional network structure. In silica, silicon is $$sp^3$$-hybridized and is thus linked to four oxygen atoms and each oxygen atom is linked to two silicon atoms forming a three-dimensional giant molecule as shown in figure. This three-dimensional network structure imparts stability to $$SiO_2$$ crystal and hence a large amount of energy is required to break the crystal resulting in high melting point.
Question 6
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Stability of hydrides of carbon family is in order :

A
$$CH_4 > SiH_4 > GeH_4 > SnH_4 > PbH_4$$

B
$$CH_4 < SiH_4 < GeH_4 < SnH_4 < PbH_4$$

C
$$CH_4 > SnH_4 > GeH_4 > SiH_4 > PbH_4$$

D
None of these

Solution

Hydrides of carbon are more stable since elelctronegativity values of carbon and hydrogen are nearly same.

Hydride of carbon family is stable when carbon is near to nucleus, thus its attraction is more towards valence shell electrons, so it is more stable.

Hydrides of silicon are less stable because in silanes hydrogen withdraw electrons from Si-H bond.
As we move down, electronegativity decreases so stability decreases.

$$CH_4 > SiH_4 > GeH_4 > SnH_4 > PbH_4$$ is correct order.
Question 7
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Silica will react in a similar way with metal sulphates (and Phosphates) as it does with carbonates, giving a solid residue and a gas. $$1$$ mole of silica reacts with $$1$$ mole of sodium sulphate, $$Na_2SO_4$$. Write the equation:

A
$$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_3(s)+SO_3(g)$$

B
$$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_4(s)+SO_2(g)$$

C
$$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_2(s)+SO_4(g)$$

D
None of these

Solution

The balanced equation is as follows:
$$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_3(s)+SO_3(g)$$
Question 8
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Water glass is :

A
Glass made up of water.

B
Sodium silicate.

C
Water gas.

D
Crystal carbonate.

Solution

Water glass, also called sodium silicate or soluble glass, a compound containing sodium oxide $$(Na_2O)$$ and silica (silicon dioxide, $$SiO_2)$$ that forms a glassy solid with the very useful property of being soluble in water.
Question 9
1 / -0

Silicon is an important constituent of:

A
rocks.

B
amalgams.

C
chlorophyll.

D
haemoglobin.

Solution

Silicon is an important constituent of rock in form of silica $$SiO_2$$.
Amalgams contains Hg.
Haemoglobin contains iron.
Chlorophyll contains Mg.
Question 10
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Elements of group $$14$$ used in semiconductors are :

A
$$C, Si, Ge$$

B
$$Si, Ge, Sn$$

C
$$Si, Ge$$

D
$$B, Si, Ge$$

Solution

Silicon is found in the basis of all electronic devices. It is a semiconductor.

Germanium is another element used in semiconductors.

Ultrapure form of Ge and Si are used to make translators and semi conductors.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 25

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The p-Block Elements Test - 25

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Question 1

Each boron atom has four $$B-O$$ bonds

Each boron atom has three $$B-O$$ bonds while other two have three $$B-O$$ bonds

Each boron atom has four $$B-O$$ bonds while other two have three $$B-O$$ bonds

Each boron atom has one $$-OH$$ groups

Solution

Question 2

both of the above

none of the above

Solution

Question 3

a linear silicone

a chlorosilane

a linear silane

a network silane

Solution

Question 4

$$SiO_{2},CO_{2}$$

$$SiO_{2},CO$$

$$SiC,CO$$

$$SiO_{2},N_{2}$$

Solution

Question 5

Oxides of carbon family $$(MO_2)$$ are all network solids with octahedral coordination.

silicon dioxide(silica) is a network solid with tetrahedral coordination and is a giant molecule.

$$GeO_2, SnO_2$$ and $$PbO_2$$ are all acidic oxides.

None of the above.

Solution

Question 6

$$CH_4 > SiH_4 > GeH_4 > SnH_4 > PbH_4$$

$$CH_4 < SiH_4 < GeH_4 < SnH_4 < PbH_4$$

$$CH_4 > SnH_4 > GeH_4 > SiH_4 > PbH_4$$

None of these

Solution

Question 7

$$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_3(s)+SO_3(g)$$

$$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_4(s)+SO_2(g)$$

$$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_2(s)+SO_4(g)$$

None of these

Solution

Question 8

Glass made up of water.

Sodium silicate.

Water gas.

Crystal carbonate.

Solution

Question 9

rocks.

amalgams.

chlorophyll.

haemoglobin.

Solution

Question 10

$$C, Si, Ge$$

$$Si, Ge, Sn$$

$$Si, Ge$$

$$B, Si, Ge$$

Solution

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