The p-Block Elements Test

Result

The p-Block Elements Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

Which is the crystalline form of silica?

A
Agate

B
Jaspar

C
Onyx

D
Crystobalite

Solution

Silica ($$SiO_2$$) occurs in various crystallographic forms such as quartz, crystobalite and tridymite that are interconvertible at suitable temperatures.
Question 2
1 / -0

Rock crystal is:

A
NaCl

B
Sand

C
Quartz

D
Agate

Solution

All clear colourless quartzs are known as rock crystal and they are used as ornamental stone.
Question 3
1 / -0

The reagent that has action on glass is:

A
aqua regia

B
hydrofluoric acid

C
oleum

D
fuming nitric acid

Solution

HF reacts with glass
$$6\ HF+SiO_2\rightarrow H_2SiF_6+2\ H_2O$$
etching of glass is done by HF.
Question 4
1 / -0

The compound used for etching of glass is:

A
HI

B
HBr

C
HCl

D
HF

Solution

HF is used in etching of glass because it gets attached to the silica glass.
$$SiO_2+6HF\rightarrow H_2\ SiF_6+2\ H_2O$$
Question 5
1 / -0

Glass reacts with HF forming :

A
$$\mathrm{F}_{2}$$

B
$$\mathrm{H}_{2}\mathrm{S}\mathrm{i}\mathrm{F}_{6}$$

C
$$ \mathrm{C}\mathrm{a}\mathrm{F}_{2}$$

D
$$\mathrm{N}\mathrm{a}\mathrm{F}$$

Solution

$$SiO_2\ + 6HF\rightarrow H_2SiF_6+2H_2O$$

When glass reacts with HF, $$H_2SiF_6$$ is formed,
Question 6
1 / -0

Borax is:

A
miscible in water.

B
immiscible in oil.

C
partially soluble in cold water & fairly soluble in hot water.

D
insoluble in water.

Solution

Borax slightly soluble in cold water, very soluble in hot water and insoluble in acids.
Question 7
1 / -0

Glass is soluble in :

A
HF

B
$$\mathrm{H}_{2}\mathrm{S}\mathrm{O}_{4}$$

C
$$\mathrm{H}\mathrm{Cl}\mathrm{O}_{4}$$

D
Aqua regia

Solution

$$4\ HF+SiO_2\xrightarrow \ SiF_4+2H_2O$$
This reaction is known as
itching of glass
$$SiO_2$$ present in glass reacts
with HF to form $$SiF_4$$. Therefore
glass is soluble in HF
Question 8
1 / -0

Kernite is a mineral containing:

A
aluminium

B
gallium

C
boron

D
silicon

Solution

The chemical formula for Kernite is $$Na_2B_4O_7.4H_2O$$. It contains boron.
Question 9
1 / -0

Solid silicones are stable up to:

A
$$100^{\circ}$$

B
$$250^{\circ}$$

C
$$300^{\circ}$$

D
$$400^{\circ}$$

Solution

Solid silicones rubbers retain their quality from -100$$^{o}$$C to 250$$^{o}$$C.
Question 10
1 / -0

The maxium covalency of aluminium is:

A
4

B
6

C
8

D
3

Solution

The maximum covalency of Aluminium is 6. Since Aluminium belongs to the 3rd period, it possesses a 3d subshell as well. As a cation it can use $$sp^{3}d^{2}$$ hybrid orbitals for a covalency of 6.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 12

Result

The p-Block Elements Test - 12

Score

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Rank

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SHARING IS CARING

Question 1

Agate

Jaspar

Onyx

Crystobalite

Solution

Question 2

NaCl

Sand

Quartz

Agate

Solution

Question 3

aqua regia

hydrofluoric acid

oleum

fuming nitric acid

Solution

Question 4

HI

HBr

HCl

HF

Solution

Question 5

$$\mathrm{F}_{2}$$

$$\mathrm{H}_{2}\mathrm{S}\mathrm{i}\mathrm{F}_{6}$$

$$ \mathrm{C}\mathrm{a}\mathrm{F}_{2}$$

$$\mathrm{N}\mathrm{a}\mathrm{F}$$

Solution

Question 6

miscible in water.

immiscible in oil.

partially soluble in cold water & fairly soluble in hot water.

insoluble in water.

Solution

Question 7

HF

$$\mathrm{H}_{2}\mathrm{S}\mathrm{O}_{4}$$

$$\mathrm{H}\mathrm{Cl}\mathrm{O}_{4}$$

Aqua regia

Solution

Question 8

aluminium

gallium

boron

silicon

Solution

Question 9

$$100^{\circ}$$

$$250^{\circ}$$

$$300^{\circ}$$

$$400^{\circ}$$

Solution

Question 10

4

6

8

3

Solution

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