The p-Block Elements Test

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The p-Block Elements Test - 73

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Weekly Quiz Competition

Question 1
1 / -0

______ is the by-product obtained in the Serpek's process.

A
Oxygen

B
Ammonia

C
Nitrogen dioxide

D
Nitric oxide

Solution

Finely powdered bauxite $(A l_{2} O_{3})$ is heated with coke and $N_{2}$ to 2000 K. Alumina forms aluminium nitride and silica is reduced to Si which is volatile. The hydrolysis of aluminium nitride gives aluminium hydroxide which on heating gives pure alumina.
Question 2
1 / -0

Which one of the following is not used for the manufacture of ammonia?

A
Haber process

B
Cyanamide process

C
Ammonia mother liquor

D
Solvay ammonia process

Solution
Question 3
1 / -0

Which one of the compound is not known?

A
$NCl_5$

B
$PCl_5$

C
$AsCl_5$

D
$NCl_3$

Solution

Phosphorous and arsenic have d-orbitals and hence can accommodate the electrons from 5 Cl atoms into them. In the case of N, the d-orbitals are absent and electrons can be accommodated only in p-orbitals of 5 Cl atoms. Hence, $PCl_5$ does not exist.

Hence, the correct option is (A).
Question 4
1 / -0

When $MnO_{2}$ is added to $KClO_{3}$ in the preparation of oxygen the decomposition temperature of $KClO_{3}$ is reduced from $350^{o}C$ to ......

A
$300^{o}C$

B
$150^{o}C$

C
$250^{o}C$

D
room temperature

Solution

When $MnO_2$ is added to $KClO_3$ in the preparation of oxygen the decomposition temperature of $KClO_3$ is reduced from $350^oC$ to $250^oC$ .
As the role of $MnO_2$ in the preparation of $O_2$ is that of a catalyst. It does not take part in the reaction. $O_2$ is prepared in the laboratory by heating $KClO_3$ which requires to be heated up to a temperature up to $350^oC$ . It is dangerous too. But $MnO_2$ acts as a $positive \ catalyst$ which enables the reaction to take place at $250^oC$ at a much faster rate.

Option C is correct.
Question 5
1 / -0

In white phosphorous $(P_4)$ molecule which one is not correct?

A
Six $P-P$ single bonds are present

B
Four $P-P$ single bonds are present

C
Four lone pairs of electron are present

D
$P\ P\ P$ bond angle is $60^o$

Solution

$P_4$ + $3NaOH$ + $3H_2O$ $\rightarrow$ $3NaH_2PO_2$ + $PH_3$
The correct Answer is options D.
Question 6
1 / -0

Oxygen can be obtained from bleaching powder by:

A
adding dilute acid

B
passing carbon dioxide

C
heating with a cobalt salt

D
adding alkalies

Solution

$\text{Oxygen can be obtained from bleaching powder by heating with a cobalt salt. Bleaching powder loses oxygen}$ $\text{in the presence of cobalt chloride catalyst.}$

$Reaction:$

$2CaOCl_2\xrightarrow{Co^{2+}}2CaCl_2+O_2$

$\text{Option C is correct.}$
Question 7
1 / -0

The electron affinity values $(kJmol^{−1})$ of three halogens X, Y, and Z respectively are −349, −333, and −325. Then X, Y, and Z respectively are :

A
$F_2 , CI_2, \ and\ Br_2$

B
$CI_2, F_2 \ and \ Br_2$

C
$$ CI_2, Br_2,\ and\ F_2 $$

D
$Br_2, CI_2, \ and \ F_2$

Solution
Question 8
1 / -0

Maximum number of compounds are known in the case of:

A
neon

B
xenon

C
krypton

D
argon

Solution
Question 9
1 / -0

In which of the following reactions, $O_{2}$ is not formed as one of the product?

A
$KClO_{3}\xrightarrow [ Heat ]{ MnO_{2} }$

B
$SnCl_{2}+HCl+O_{3}\rightarrow$

C
$FeSO_{4}+H_{2}SO_{4}+O_{3}\rightarrow$

D
$PbS+O_{3}\rightarrow$

Solution
Question 10
1 / -0

Ammonia will be obtained in:

A
$CaCN_2 +H_2O \to$

B
$NH_4H_2PO_4 \ \xrightarrow {Heat}$

C
Both (A) and (B)

D
None

Solution

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The p-Block Elements Test - 73

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The p-Block Elements Test - 73

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Question 1

Oxygen

Ammonia

Nitrogen dioxide

Nitric oxide

Solution

Question 2

Haber process

Cyanamide process

Ammonia mother liquor

Solvay ammonia process

Solution

Question 3

NCl5NCl_5NCl5​

PCl5PCl_5PCl5​

AsCl5AsCl_5AsCl5​

NCl3NCl_3NCl3​

Solution

Question 4

300oC300^{o}C300oC

150oC150^{o}C150oC

250oC250^{o}C250oC

room temperature

Solution

Question 5

Six P−PP-PP−P single bonds are present

Four P−PP-PP−P single bonds are present

Four lone pairs of electron are present

P P PP\ P\ PP P P bond angle is 60o60^o60o

Solution

Question 6

adding dilute acid

passing carbon dioxide

heating with a cobalt salt

adding alkalies

Solution

Question 7

F2,CI2, and Br2 F_2 , CI_2, \ and\ Br_2 F2​,CI2​, and Br2​

CI2,F2 and Br2 CI_2, F_2 \ and \ Br_2 CI2​,F2​ and Br2​

$$ CI_2, Br_2,\ and\ F_2 $$

Br2,CI2, and F2 Br_2, CI_2, \ and \ F_2 Br2​,CI2​, and F2​

Solution

Question 8

neon

xenon

krypton

argon

Solution

Question 9

KClO3→HeatMnO2KClO_{3}\xrightarrow [ Heat ]{ MnO_{2} } KClO3​MnO2​Heat​

SnCl2+HCl+O3→SnCl_{2}+HCl+O_{3}\rightarrowSnCl2​+HCl+O3​→

FeSO4+H2SO4+O3→FeSO_{4}+H_{2}SO_{4}+O_{3}\rightarrowFeSO4​+H2​SO4​+O3​→

PbS+O3→PbS+O_{3}\rightarrowPbS+O3​→

Solution

Question 10

CaCN2+H2O→CaCN_2 +H_2O \to CaCN2​+H2​O→

NH4H2PO4 →HeatNH_4H_2PO_4 \ \xrightarrow {Heat}NH4​H2​PO4​ Heat​

Both (A) and (B)

None

Solution

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$NCl_5$

$PCl_5$

$AsCl_5$

$NCl_3$

$300^{o}C$

$150^{o}C$

$250^{o}C$

Six $P-P$ single bonds are present

Four $P-P$ single bonds are present

$P\ P\ P$ bond angle is $60^o$

$F_2 , CI_2, \ and\ Br_2$

$CI_2, F_2 \ and \ Br_2$

$Br_2, CI_2, \ and \ F_2$

$KClO_{3}\xrightarrow [ Heat ]{ MnO_{2} }$

$SnCl_{2}+HCl+O_{3}\rightarrow$

$FeSO_{4}+H_{2}SO_{4}+O_{3}\rightarrow$

$PbS+O_{3}\rightarrow$

$CaCN_2 +H_2O \to$

$NH_4H_2PO_4 \ \xrightarrow {Heat}$