The p-Block Elements Test

Result

The p-Block Elements Test - 50

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Weekly Quiz Competition

Question 1
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Which of the following phosphorus is the most reactive?

A
Red phosphorus

B
White phosphorus

C
Scarlet phosphorus

D
Violet phosphorus

Solution

White phosphorus is highly reactive, bursting into flames when exposed to air, and is thus stored under water.
Question 2
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Platinum is used as a catalyst in:

A
oxidation of ammonia to form nitric acid

B
hydrogenation of oils

C
production of synthetic rubber

D
synthesis of methanol

Solution

In the Ostwald process, ammonia is converted to nitric acid in a two step process. It is oxidised with oxygen in the presence of platinum catalyst. The overall reaction is as follows:
$$4NH_3 + 5O_2 \rightarrow 4NO + 6H_2O$$
Question 3
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Which of the following noble gases has the highest positive electron gain enthalpy value?

A
Helium

B
Krypton

C
Argon

D
Neon

E
Xenon

Solution

Noble gas Electron gain enthalpy
$$(kJ\ mol^{-1})$$
$$He$$ $$48$$
$$Ne$$ $$116$$
$$Ar$$ $$96$$
$$Kr$$ $$96$$
$$Xe$$ $$77$$
Question 4
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In pyrophosphoric acid, $${ H }_{ 4 }{ P }_{ 2 }{ O }_{ 7 }$$, number of $$\sigma -$$ and $$d\pi -p\pi $$ bonds respectively are

A
$$8$$ and $$2$$

B
$$6$$ and $$2$$

C
$$12$$ and zero

D
$$12$$ and $$2$$

Solution

$$O=\overset{\,\,\,\,\,\,O-H}{\overset{|}{\underset{\,\,\,\,\,O-H}{\underset{|}{P}}}}-O-\overset{\,\,\,\,\,\,O-H}{\overset{|}{\underset{\,\,\,\,\,O-H}{\underset{|}{P}}}}=O$$

The two double bonds contributes 2 $$\sigma$$ and 2 $$d\pi-p\pi$$.
There are 4 O-H groups = 4 $$\sigma$$ bonds
There are 6 P-O type of bonds.

Total no. of $$\sigma$$ bonds = 2+ 4+ 6 =12
Total no. of $$d\pi-p\pi$$ bonds= 2

Hence, the correct option is D.
Question 5
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Which can do glass etching?

A
$$HI{ O }_{ 4 }$$

B
$$Si{ F }_{ 4 }$$

C
$$HF$$

D
$$H{ NO }_{ 3 }$$

Solution

Glass is a mixture of sodium and calcium silicate. It reacts with $$HF$$ forming sodium and calcium fluorosilicates respectively.
$${ Na }_{ 2 }Si{ O }_{ 3 }+6HF\longrightarrow { Na }_{ 2 }Si{ F }_{ 6 }+3{ H }_{ 2 }O$$
$$CaSi{ O }_{ 3 }+6HF\longrightarrow CaSi{ F }_{ 6 }+3{ H }_{ 2 }O$$
The etching of glass is based on these reactions.
Question 6
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Which product will be obtained in the following reaction?
$$P_4(s) + 3NaOH(ag) + 3H_2O(l) \rightarrow $$

A
$$PH_3(g) + 3NaH_2P0_2 (aq)$$

B
$$PH_3 (g) + 3Na_2 HPO_2 (aq)$$

C
$$2PH_3(g) 3Na_2 HPO_2 (aq)$$

D
$$2PH_3(g) + 3NaH_2 PO_2 (aq)$$

Solution

$$P_4(s) + 3NaOH(ag) + 3H_2O(l) \rightarrow \underset{Phosphine}{PH_3(g)}+\underset{Sodium \, hypophosphite}{3NaH_2PO_2(aq)}$$
This reaction is used for the preparation of phosphine gas in the laboratory.
Question 7
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The maximum covalency of nitrogen is

A
$$3$$

B
$$4$$

C
$$5$$

D
$$6$$

Solution

Nitrogen has two 2s and three 2p valence electrons. By sharing the three 2p electrons, nitrogen can form three covalent bonds. For example, NH3. But still the nitrogen atom has a lone pair of electrons from 2s orbital. By donating these two electrons from lone pair, it can form one bond. For example, NH4+.
Thus, nitrogen can form four bonds
Question 8
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Which compound of nitrogen is formed when $$CaNH$$ reacts with hot water?

A
$$NH_{3}$$

B
$$N_{2}O$$

C
$$NH_{2}NH_{2}$$

D
$$NO_{2}$$

Solution

When $$CaNH$$ reacts with hot water it forms $$NH_3,Ca(OH)_2$$.
$$CaNH+2H_2O\rightarrow Ca(OH)_2+NH_3$$.
Henceoption is correct.
Question 9
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Hydrolysis of $$N{ Cl }_{ 3 }$$ gives $$N{ H }_{ 3 }$$ and $$X$$, which of the following is $$X$$?

A
$$HCl{ O }_{ 4 }$$

B
$$HCl{ O }_{ 3 }$$

C
$$HOCl$$

D
$$HCl{ O }_{ 2 }$$

Solution

Hydrolysis of $$N{ Cl }_{ 3 }$$ gives $$N{ H }_{ 3 }$$ or $$N{ H }_{ 4 }OH$$ and $$HClO$$ as
$$N{ Cl }_{ 3 }+4{ H }_{ 2 }O\longrightarrow N{ H }_{ 4 }OH+3HOCl$$
Question 10
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Noble gas are adsorbed by:

A
anhydrous calcium chloride

B
ferric hydroxide

C
concentrated $${ H }_{ 2 }S{ O }_{ 4 }$$

D
activated coconut charcoal

Solution

Noble gases are adsorbed by coconut charcoal. The adsorption of different noble gases occurs at different temperatures. Hence, charcoal is used to separate these gases. Helium is not adsorbed by charcoal.

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Noble gas	Electron gain enthalpy $$(kJ\ mol^{-1})$$
$$He$$	$$48$$
$$Ne$$	$$116$$
$$Ar$$	$$96$$
$$Kr$$	$$96$$
$$Xe$$	$$77$$

The p-Block Elements Test - 50

Result

The p-Block Elements Test - 50

Score

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Rank

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SHARING IS CARING

Question 1

Red phosphorus

White phosphorus

Scarlet phosphorus

Violet phosphorus

Solution

Question 2

oxidation of ammonia to form nitric acid

hydrogenation of oils

production of synthetic rubber

synthesis of methanol

Solution

Question 3

Helium

Krypton

Argon

Neon

Xenon

Solution

Question 4

$$8$$ and $$2$$

$$6$$ and $$2$$

$$12$$ and zero

$$12$$ and $$2$$

Solution

Question 5

$$HI{ O }_{ 4 }$$

$$Si{ F }_{ 4 }$$

$$HF$$

$$H{ NO }_{ 3 }$$

Solution

Question 6

$$PH_3(g) + 3NaH_2P0_2 (aq)$$

$$PH_3 (g) + 3Na_2 HPO_2 (aq)$$

$$2PH_3(g) 3Na_2 HPO_2 (aq)$$

$$2PH_3(g) + 3NaH_2 PO_2 (aq)$$

Solution

Question 7

$$3$$

$$4$$

$$5$$

$$6$$

Solution

Question 8

$$NH_{3}$$

$$N_{2}O$$

$$NH_{2}NH_{2}$$

$$NO_{2}$$

Solution

Question 9

$$HCl{ O }_{ 4 }$$

$$HCl{ O }_{ 3 }$$

$$HOCl$$

$$HCl{ O }_{ 2 }$$

Solution

Question 10

anhydrous calcium chloride

ferric hydroxide

concentrated $${ H }_{ 2 }S{ O }_{ 4 }$$

activated coconut charcoal

Solution

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