The p-Block Elements Test

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The p-Block Elements Test - 63

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Weekly Quiz Competition

Question 1
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The silicate anion in the mineral kaolinite is a chain of three $$ \displaystyle Si{ O }_{ 4 }$$ tetrahedral that share corners with adjacent tetrahedral. The mineral also contains $$ \displaystyle { Ca }^{ 2+ }$$ ions, $$ \displaystyle { Ca }^{ 2+ }$$ ions, and water molecules in a 1 :1 :1 ratio. Mineral is represented as :

A
$$ \displaystyle CaCuS{ i }_{ 3 }{ O }_{ 10 }\quad .\quad { H }_{ 2 }O$$

B
$$ \displaystyle CaCuS{ i }_{ 3 }{ O }_{ 10 }\quad .\quad 2{ H }_{ 2 }O$$

C
$$ \displaystyle { Ca }_{ 2 }{ Cu }_{ 2 }{ Si }_{ 3 }{ O }_{ 10 }\quad .\quad 2{ H }_{ 2 }O$$

D
None of these

Solution

The formula of silicate with three $$SiO_4$$ tetrahedral that share corners with adjacent tetrahedral = $$Si_3O_10^{8-}$$
Charge on $$Ca = +2$$
Charge on $$Cu= +2$$
Charge on $$H_2O= 0$$
To balance the $$-8$$ charge of silicate with $$Ca^{2+}, Cu^{2+}$$ and $$H_2O$$ in ration $$1:1:1$$ number of each required $$=2$$
Hence the formula of mineral$$= Ca_2Cu_2Si_3O_{10}.2H_2O$$
Question 2
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Borax is used as a buffer since-

A
Its aqueous solution contains equal amount of weak acid and its salt.

B
It is easily available.

C
Its aqueous solution contains equal amount of strong acid and its salt.

D
Statement that borax is a buffer, is wrong.

Solution

As it can be seen that,
aqueous solution of borax contains equal amount of weak acid and its salt so it can acts as buffer solution.
Question 3
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When borax is dissolved in water :

A
$$ B(OH)_3 $$ is formed only

B
$$ [B(OH)_4]^- $$ is formed only

C
Both $$ B(OH)_3 $$ and $$ [B(OH)_4]^- $$ are formed

D
$$ [B_3O_3(OH)_4]^- $$ is formed only
Question 4
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Which of the following product is formed when $$SiF_4$$ reacts with water?

A
$$SiF_3$$

B
$$H_4SiO_4$$

C
$$H_2SO_4$$

D
$$H_2SiF_4$$

Solution

In reaction with water, $$SiF_4$$ (like $$SiCI_4$$) gets hydrolysed to form $$H_4SiO_4$$ (silicic acid).
$$SiF_4+4H_2O\longrightarrow Si(OH)_4$$ or $$H_4SiO_4+ 4HF$$
(Silicic acid)
Question 5
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Jena glass is a mixture of:

A
zinc and barium borosilicates

B
sodium and iron silicate

C
sodium and aluminium borosilicates

D
oxides of the rate earth elements

Solution

Option $$(A)$$ is correct.
Jena glass is a mixture of zinc and barium borosilicates and is resistant to heat, chemicals and shock. It was used for chemical glassware, thermometers etc.
Question 6
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The ground glass stopper is often seen to get stuck in the neck of glass bottles containing aq $$NaOH$$ solution This is due to:

A
formation of solid $$\displaystyle Na_{2}CO_{3}$$ around the neck of the bottle due to NaoH reacting with atmospheric $$\displaystyle CO_{2}$$

B
formation of solid $$\displaystyle Na_{2}SiO_{3}$$ around the neck of the bottle

C
creation of partial vacuum due to highly hygroscopic nature of $$NaOH$$

D
high coefficient of thermal expansion of glass

Solution

The ground glass stopper is often seen to get stuck in the neck of glass bottles containing aq $$NaOH$$ solution This is due to formation of solid $$Na_2SiO_3$$ around the neck of the bottle
$$\displaystyle 2NaOH(aq)+SiO_{2}\rightarrow \underset{fuses\: \: with\: \: glass}{Na_{2}SiO_{3}(s)+H_{2}O}$$
Hence option $$B$$ is correct.
Question 7
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Electronic configuration of only one p-block element is exceptional. One molecule of that element consists of how many atoms of it?

A
One

B
Two

C
Three

D
Four

Solution

The electronic configuration of an only p-block element is exceptional. One molecule of that element consists of only one atom of it.

As the exception is found in only He, as helium has the electronic configuration to be $$1s^2$$. But other member of the same group has $$ns^2\; np^6$$ configuration.

So, this is an exceptional case where He does not resemble its group in its configuration.
And as He is a noble gas element so it is monoatomic gas.
Question 8
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Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol?

A
$$K_{3}[Fe(CN)_{6}]$$

B
$$K_{2}CrO_{4}$$

C
$$KBr$$

D
$$K_{2}SO_{4}$$

Solution

(i) Sols are coagulated by oppositely charged ions.
(ii) Greater the charge on ion causing coagulation, higher will be its coagulating power.
$$\therefore Fe(OH)_{3}$$ is positively charged sol.
$$\therefore$$ Anion will coagulate this sol.
(a) $$K_{3} [Fe(CN)_{6}]\rightarrow 3K^{+} + [Fe(CN)_{6}]^{3-}$$
(b) $$K_{2}Cr_{2}O_{7}\rightarrow 2K^{+} + Cr_{2}O_{7}^{2-}$$
(c) $$K Br\rightarrow K^{+} + Br^{-}$$
(d) $$K_{2}SO_{4} \rightarrow 2K^{+} + SO_{4}^{2-}$$
$$\because$$ In $$KBr, Br^{-}$$ has smallest negative charge among given choices.
$$\therefore$$ It will be least effective in coagulating $$Fe(OH)_{3}$$.
Question 9
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Stannite is an ore of __________.

A
tin

B
lead

C
germanium

D
carbon

Solution

Stannite is a mineral, a sulfide of copper, iron, and tin. The chemical formula $${Cu}_2FeSnS_4$$.
Question 10
1 / -0

The following element forms a molecule with eight of its own atoms:

A
$$Si$$

B
$$S$$

C
$$Cl$$

D
$$P$$

Solution

Sulphur has the second-highest property of carbon. Its molecule has eight atoms bonded together.

Hence, option B is correct.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 63

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The p-Block Elements Test - 63

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Question 1

$$ \displaystyle CaCuS{ i }_{ 3 }{ O }_{ 10 }\quad .\quad { H }_{ 2 }O$$

$$ \displaystyle CaCuS{ i }_{ 3 }{ O }_{ 10 }\quad .\quad 2{ H }_{ 2 }O$$

$$ \displaystyle { Ca }_{ 2 }{ Cu }_{ 2 }{ Si }_{ 3 }{ O }_{ 10 }\quad .\quad 2{ H }_{ 2 }O$$

None of these

Solution

Question 2

Its aqueous solution contains equal amount of weak acid and its salt.

It is easily available.

Its aqueous solution contains equal amount of strong acid and its salt.

Statement that borax is a buffer, is wrong.

Solution

Question 3

$$ B(OH)_3 $$ is formed only

$$ [B(OH)_4]^- $$ is formed only

Both $$ B(OH)_3 $$ and $$ [B(OH)_4]^- $$ are formed

$$ [B_3O_3(OH)_4]^- $$ is formed only

Question 4

$$SiF_3$$

$$H_4SiO_4$$

$$H_2SO_4$$

$$H_2SiF_4$$

Solution

Question 5

zinc and barium borosilicates

sodium and iron silicate

sodium and aluminium borosilicates

oxides of the rate earth elements

Solution

Question 6

formation of solid $$\displaystyle Na_{2}CO_{3}$$ around the neck of the bottle due to NaoH reacting with atmospheric $$\displaystyle CO_{2}$$

formation of solid $$\displaystyle Na_{2}SiO_{3}$$ around the neck of the bottle

creation of partial vacuum due to highly hygroscopic nature of $$NaOH$$

high coefficient of thermal expansion of glass

Solution

Question 7

One

Two

Three

Four

Solution

Question 8

$$K_{3}[Fe(CN)_{6}]$$

$$K_{2}CrO_{4}$$

$$KBr$$

$$K_{2}SO_{4}$$

Solution

Question 9

tin

lead

germanium

carbon

Solution

Question 10

$$Si$$

$$S$$

$$Cl$$

$$P$$

Solution

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