The p-Block Elements Test

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The p-Block Elements Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Which compound is solid ?

A
$$CO_{2}$$

B
$$NH_{3}$$

C
$$PH_{3}$$

D
$$SiO_{2}$$

Solution

$$CO_2$$, $$NH_3$$, $$PH_3$$ are all gases in their natural forms whereas silica is found as various crystallographic forms - quartz, crystobalite, tridymite etc.
Question 2
1 / -0

Which is the amorphous form of silica?

A
Quartz

B
Tridymite

C
Onyx

D
Crystobalite

Solution

Quartz, tridymite and cristobalite are all crystalline forms of silica however, onyx is a crypto-crystalline form of silica (Cryptocrystalline is a rock texture made up of such minute crystals that its crystalline nature is only vaguely revealed even microscopically by transmitted polarized light). Keisulghur is an amorphous form of silica.
Question 3
1 / -0

Which is not true about $$SiO_{2}$$:

A
It is a network solid

B
It is attacked by molten NaOH

C
It is attacked by HF

D
It is the basic structural unit of silicates

Solution

Silica is attacked only by HF and NaOH and it is unreactive to most other acids, metals and halogens. However, the basic structural unit of silica is $$SiO_4^{4-}$$.
So, correct option is 'D'
Question 4
1 / -0

Whcih one of the following is used as an acidic flux in metallurgy?

A
$$CaO$$

B
$$SiO_{2}$$

C
$$Na_{2}CO_{3}$$

D
$$SO_{2}$$

Solution

Silica is used as acidic flux because it is almost non-reactive due to the very high bond enthalpy of $$Si-O$$ bond. It resists the attack by halogens, dihydrogen and most of the acids and metals even at the elevated temperature. However, $$HF$$ and $$NaOH$$ react with them to form $$SiF_4$$ and $$Na_2CO_3$$ respectively.
Question 5
1 / -0

When $$SiO_{2}$$ is reacted with sodium carbonate, the gas liberated is :

A
$$CO$$

B
$$O_{2}$$

C
$$CO_{2}$$

D
$$O_{3}$$

Solution

The reaction is as follows:
$$SiO_2 + Na_2CO_3 \rightarrow Na_2SiO_3 + CO_2$$
This reaction is an example of corrosion of glass.
Question 6
1 / -0

When $$\alpha$$-quartz is heated to 575$$^{\circ}$$C, it changes to:

A
onyx

B
$$\beta$$-quartz

C
tridymite

D
crystobalite

Solution

$$\alpha$$-quartz when heated at 575$$^{\circ}$$C to form $$\beta$$-quartz. This phenomena is called inversion.
Question 7
1 / -0

The purest form of silica is:

A
quartz

B
flint

C
sand stone

D
jaspar

Solution

Quartz is the crystalline form of Silica and hence is the purest form of Silica.
Question 8
1 / -0

Which oxide has three dimensional strucutre ?

A
$$CO_{2}$$

B
$$SO_{2}$$

C
CO

D
$$SiO_{2}$$

Solution

CO, $$CO_2$$ are linearly shaped molecules whereas $$SO_2$$ is a bent shaped molecule. $$SiO_2$$ has a three dimensional structure as Si in $$SiO_2$$ is $$sp_3$$ hybridised with no lone pairs.
Question 9
1 / -0

The final product formed when silica reacts with hydrogen fluoride is :

A
$$SiF$$

B
$$H_{2}SiF_{6}$$

C
$$H_{2}SiF_{4}$$

D
$$H_{2}SiO_{3}$$

Solution

The final product formed when silica $$(SiO_2)$$ reacts with hydrogen fluoride $$(HF)$$ is $$H_2SiF_6$$.

The reactions are as follows:

$$SiO_2+4HF \rightarrow SiF_4 + 2H_2O$$
$$3SiF_4 + 4H_2O \rightarrow 2H_2SiF_6 + H_4SiO_4$$
Question 10
1 / -0

The number of Oxygen atoms bonded to each
silicon atom in silica crystal is :

A
1

B
2

C
3

D
4

Solution

every Silicon atom in silica forms 4 sigma bonds with oxygen atoms.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 16

Result

The p-Block Elements Test - 16

Score

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SHARING IS CARING

Question 1

$$CO_{2}$$

$$NH_{3}$$

$$PH_{3}$$

$$SiO_{2}$$

Solution

Question 2

Quartz

Tridymite

Onyx

Crystobalite

Solution

Question 3

It is a network solid

It is attacked by molten NaOH

It is attacked by HF

It is the basic structural unit of silicates

Solution

Question 4

$$CaO$$

$$SiO_{2}$$

$$Na_{2}CO_{3}$$

$$SO_{2}$$

Solution

Question 5

$$CO$$

$$O_{2}$$

$$CO_{2}$$

$$O_{3}$$

Solution

Question 6

onyx

$$\beta$$-quartz

tridymite

crystobalite

Solution

Question 7

quartz

flint

sand stone

jaspar

Solution

Question 8

$$CO_{2}$$

$$SO_{2}$$

CO

$$SiO_{2}$$

Solution

Question 9

$$SiF$$

$$H_{2}SiF_{6}$$

$$H_{2}SiF_{4}$$

$$H_{2}SiO_{3}$$

Solution

Question 10

1

2

3

4

Solution

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