The p-Block Elements Test

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The p-Block Elements Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

Which of the followings forms the base of talcum powder?

A
Zinc stearate

B
Sodium aluminium silicate

C
Magnesium hydrosilicate

D
Chalk

Solution

Magnesium hydrosillicate ($$ \displaystyle Mg_3Si_2O_5(OH)_4$$) forms base of Talcum powder.

Talcum powder is used in baby powder, adult body and facial powders.

Hence, option C is correct.
Question 2
1 / -0

What type of oxide would Eka-Aluminium(Gallium) form?

A
$$GaO_3$$

B
$$Ga_3O_2$$

C
$$Ga_2O_3$$

D
$$GaO$$

Solution

Eka-aluminium (Gallium) would form the oxide $$\displaystyle Ga_2O_3$$.
Ga has 3 valence electrons and $$O$$ has 6 valence electrons. Ga shows a $$+3$$ oxidation state and $$O$$ shows $$-2 $$ oxidation state. So, 2 Ga atoms will share 6 electrons and $$3-O$$ atoms will share 6 electrons to form $$\displaystyle Ga_2O_3$$.
Question 3
1 / -0

Silica is heated with carbon in electric furnace to form :

A
silicon carbonate

B
silicon carbide or carborundum

C
silicon monoxide

D
none

Solution

When quartz or sand are heated with an excess of coke in an electric arc furnace at $$2000-2500$$$$^{o}$$C silicon carbide or carborundum is formed.
$$SiO_2 + 3C \rightarrow SiC +2CO$$
Question 4
1 / -0

Quartz is the form ?

A
$$CO_{2}$$

B
$$SiO_{2}$$

C
$$SO_{2}$$

D
$$NO_{2}$$

Solution

Silica is found in many crystalline and amorphous forms . Quartz is a crystalline form of silica.
Question 5
1 / -0

The structure of $$SiO_{2}$$ ?

A
trigonal

B
linear

C
tetrahedral

D
angular

Solution

Si in Silica is $$sp_3$$ hybridised giving it a tetrahedral structure.
Question 6
1 / -0

Which of the following is used for making optical
instruments :

A
$$SiO_{2}$$

B
Si

C
$$SiH_{4}$$

D
SiC

Solution

Silica is an important ingredient in making glass, which is extensively used in making optical devices.
Question 7
1 / -0

Density is highest for :

A
Si

B
Ge

C
Sn

D
Pb

Solution

Explanation:
The density of elements increases as we move from top to bottom in a group.

In group 14 elements, as we move from $$C$$ to $$Pb$$ the number of orbits increases.

So the size of the atom increases and its density also increases.

Thus $$Pb$$ has the highest density.

Final Answer: Correct option (D).
Question 8
1 / -0

Silicones are:

A
toxic

B
non-toxic

C
bitter

D
sour

Solution

Explanation

Silicones belong to the organo-silicon polymer family since they are comprised entirely of carbon, silicon, and oxygen atoms. these elements are naturally occurring and safe.

Due to the presence of alkyl groups on silicon atoms, silicones are hydrophobic in nature. They have strong dielectric strength and thermal stability in general. They are oxidation-resistant.

They are commonly employed in waterproofing sealants, insulators, greases, and textiles because of their qualities. They're also biocompatible. They're also found in surgical plants.

Thus, the low reactivity with chemicals and inertness towards it makes silicones a non-toxic one.

Henceforth, the correct answer is option B.
Question 9
1 / -0

Silica dissolves in NaOH solution to form:

A
quartz

B
sodium silicate

C
carborundum

D
jaspar

Solution

Silica is almost non-reactive due to the presence of very strong Si-C bonds. They are unaffected by dihydrogen, halogen and acids except $$HF$$ and $$NaOH$$ to form $$SiF_4$$ and $$Na_2SiO_3$$ respectively. The reaction is as follow:
$$SiO_{2} + 2NaOH \rightarrow Na_{2}SiO_{3} +H_{2}O$$
Question 10
1 / -0

In silicones, silicon is strongly linked to:

A
oxygen

B
nitrogen

C
sulphur

D
carbon.

Solution

$$ Si-O-Si-O-Si $$ bonds are found in silicones.

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The p-Block Elements Test - 11

Result

The p-Block Elements Test - 11

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SHARING IS CARING

Question 1

Zinc stearate

Sodium aluminium silicate

Magnesium hydrosilicate

Chalk

Solution

Question 2

$$GaO_3$$

$$Ga_3O_2$$

$$Ga_2O_3$$

$$GaO$$

Solution

Question 3

silicon carbonate

silicon carbide or carborundum

silicon monoxide

none

Solution

Question 4

$$CO_{2}$$

$$SiO_{2}$$

$$SO_{2}$$

$$NO_{2}$$

Solution

Question 5

trigonal

linear

tetrahedral

angular

Solution

Question 6

$$SiO_{2}$$

Si

$$SiH_{4}$$

SiC

Solution

Question 7

Si

Ge

Sn

Pb

Solution

Question 8

toxic

non-toxic

bitter

sour

Solution

Question 9

quartz

sodium silicate

carborundum

jaspar

Solution

Question 10

oxygen

nitrogen

sulphur

carbon.

Solution

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