The p-Block Elements Test

Result

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