The p-Block Elements Test

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The p-Block Elements Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following cuts ultraviolet rays?

A
Soda glass.

B
Crookes glass.

C
Pyrex.

D
None of these.

Solution

Crookes glass: A type of glass that contains cerium and other rare earths.

It does not allow the passage of ultra violet ray and is used for making lenses.
Question 2
1 / -0

In casting of metal, silicon is used as :

A
oxidizer

B
semi conductor

C
deoxidizer

D
none of these

Solution

Ferrosilicon is used as a source of silicon to reduce metals, so in casting of metals Si is used as deoxidiser.
Question 3
1 / -0

Which of the following has the highest first ionization energy?

A
Lithium

B
Beryllium

C
Boron

D
Carbon

Solution

Carbon has the highest first ionization energy.
The order of the ionization energies is $$Li<Be<B<C$$
On moving from left t right in a period, the ionization energy increases as the effective nuclear charge increases and the size decreases. The removal of electron becomes more and more difficult.
Question 4
1 / -0

Quartz is a crystalline variety of:

A
Silicon carbide

B
Sodium silicate

C
Silica

D
Silicon

Solution

Quartz is a covalent crystal having a framework of silicates or silica, i.e. a three-dimensional network where all the four oxygen atoms of each of $$SiO_{4}$$ tetrahedron are shared.
Question 5
1 / -0

At room temperature the solid compound is :

A
$$CO_2$$

B
$$SiO_2$$

C
$$NO_2$$

D
$$SO_2$$

Solution

Only $$SiO_2$$ is solid all else are gases at room temperature.
Question 6
1 / -0

Which involves breaking of covalent bonds?

A
Boiling of $$H_2S$$

B
Melting of $$SiO_2$$

C
Melting of $$KCN$$

D
Boiling of $$CCl_4$$

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.
And melting of this breaks covalent bonds between molecules.
Question 7
1 / -0

Name of the structure of silicates in which three oxygen atoms of $$[SiO_4]^{4+}$$ are shared is :

A
pyro-silicate.

B
sheet silicate.

C
linear chain silicate.

D
three dimensional silicate.

Solution

The structure of silicates has been found with the help of X-ray diffraction techniques

In sheet silicates, out of four oxygen atoms of $$[SiO_4]^{4+}$$, three atoms are shared.

This gives two dimensional molecules of the composition $$(Si_2O_5)_n^{2n-}$$.

They form layer structure.

Examples include mica or muscovite and Talc.
Question 8
1 / -0

The minerals having silicate chains are collectively called :

A
olivine.

B
zircon.

C
pyroxenes.

D
natrolite.

Solution

Silicate minerals containing chains are termed as inosilicates.

Pyroxenes are a group of important rock-forming inosilicate minerals found in many igneous and metamorphic rocks.

Hence, option C is correct.
Question 9
1 / -0

$$p\pi - p\pi$$ multiple bonds occur between :

A
$$C$$ and $$C$$

B
$$C$$ and $$O$$

C
$$C$$ and $$N$$

D
All the above

Solution

D) All the above.

$$-C=C=C-$$

$$-C\equiv N$$

$$O=C=O$$
Question 10
1 / -0

The colour of blue glass is due to the presence of oxide of :

A
chromium

B
cobalt

C
gold

D
silver

Solution

Cobalt is a very intense glass colorant and very little is required to show a noticeable amount of colour. Colour of Cobalt glass is blue.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 26

Result

The p-Block Elements Test - 26

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SHARING IS CARING

Question 1

Soda glass.

Crookes glass.

Pyrex.

None of these.

Solution

Question 2

oxidizer

semi conductor

deoxidizer

none of these

Solution

Question 3

Lithium

Beryllium

Boron

Carbon

Solution

Question 4

Silicon carbide

Sodium silicate

Silica

Silicon

Solution

Question 5

$$CO_2$$

$$SiO_2$$

$$NO_2$$

$$SO_2$$

Solution

Question 6

Boiling of $$H_2S$$

Melting of $$SiO_2$$

Melting of $$KCN$$

Boiling of $$CCl_4$$

Solution

Question 7

pyro-silicate.

sheet silicate.

linear chain silicate.

three dimensional silicate.

Solution

Question 8

olivine.

zircon.

pyroxenes.

natrolite.

Solution

Question 9

$$C$$ and $$C$$

$$C$$ and $$O$$

$$C$$ and $$N$$

All the above

Solution

Question 10

chromium

cobalt

gold

silver

Solution

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