The p-Block Elements Test

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The p-Block Elements Test - 58

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Question 1
1 / -0

Charge on a pseudo halide ion is:

A
$$-1$$

B
$$-2$$

C
$$-3$$

D
$$(1)$$ & $$(2)$$

Solution
Question 2
1 / -0

The electronic configuration of halogen is :

A
$$ns^{2}np^{6}$$

B
$$ns^{2}np^{3}$$

C
$$ns^{2}np^{5}$$

D
$$ns^{2}$$

Solution

Halogen belongs to chlorine family.
So electronic configuration of halogen is $$ns^{2} np^{5}$$
Question 3
1 / -0

Two major requirements for preparation of ammonia are

A
Low temperature and high pressure

B
Low temperature and present pressure

C
High temperature and low pressure

D
High temperature and high pressure

Solution

This reaction is
(a) reversible,
(b) exothermic, and
(c) proceeds with a decrease in volume.
According to the Le Chatelier's principle, the favorable conditions for the formation of ammonia are,
Low temperature
The temperature should be remain as low as possible, (although at unusually low temperatures, the rate of reaction becomes slow). It has been found that the temperature, which optimizes the yield of ammonia for the reaction, is maximum at about 500°C.
High pressure
Since Haber's process proceeds with a decrease in volume, it is favored by high pressure. In actual practice, a pressure of 200 - 900 atmospheres is employed.
Question 4
1 / -0

The electronic configuration of chlorine is _________

A
2, 7

B
2, 8, 8, 7

C
2, 8, 7

D
2, 7, 8

Solution
Question 5
1 / -0

In which of the following, oxidation number of chlorine is $$ + 5 ?$$

A
$$Cl_{2}O_{7}$$

B
$$\mathrm { ClO } _ { 3 } ^ { - }$$

C
$$\mathrm { CHO } ^ { - }$$

D
$$\mathrm { ClO } _ { 4 } ^ { - }$$

Solution

Oxidation number of $$Cl_2O_7$$:-
$$2x-14=0$$
$$x=7$$
Oxidation number of $${ClO_3}^{-}$$:-
$$x-6=-1$$
$$x=5$$
Oxidation number of $$ClO^-$$:-
$$x-2=-1$$
$$x=1$$
Oxidation number of $${ClO_4}^-$$:-
$$x-8=-1$$
$$x=7$$
hence option B is correct.
Question 6
1 / -0

Which of the following compounds undergoes haloform reaction?

A
$$CH_{3}COCH_{3}$$

B
$$HCHO$$

C
$$CH_{3}CH_{2}Br$$

D
$$CH_{3} - O - CH_{3}$$

Solution

The haloform reaction comprises the reaction of a halogen with a methyl ketone (a molecule containing the $$R–CO–CH_3$$ grouping) in the presence of a base.

Among the given compound, propanone undergoes haloform reaction as it contains a methyl group attached to carbonyl carbon.

Hence, option A is correct.
Question 7
1 / -0

Which of the following is correct statement regarding $$N(CH_3)_3$$ and $$N(SiH_3)_3$$?

A
$$N(SiH_3)_3$$ is planar and more basic than $$N(CH_3)_3$$

B
$$N(SiH_3)_3$$ is planar and less basic than $$N(CH_3)_3$$

C
$$N(CH_3)_3$$ is planar and more basic than $$N(SiH_3)_3$$

D
$$N(CH_3)_3$$ is pyramidal and less basic than $$N(SiH_3)_3$$

Solution

$$N(SiH_3)_3$$ is planar due to back bonding and $$N(CH_3)_3$$ more basic due to presence of lone pair electrons.
Question 8
1 / -0

Which of the following is incorrect?

A
Red $$P$$ is toxic

B
White $$'P'$$ is highly soluble in $$CS_{2}$$

C
Black $$'P'$$ is thermodynamic is most stable

D
White $$'P'$$ is soluble in $$NaOH$$ evolves $$PH_{3}$$

Solution

Red P is not considered as toxic in its pure form.
Question 9
1 / -0

Which of the following is true for $$N_{2}O_{5}$$?

A
Paramagnetic

B
Anhydride of $$HNO_{2}$$

C
Brown gas

D
Exist in solid In form of $$[NO^{+}_{2}][NO_{3}^{-}]$$

Solution

$$N_{2}O_{5}$$ in solid form exists as $$NO_{3}^{-}$$ and $$NO_{2}^{-}$$.
Question 10
1 / -0

Why is argon used in lamps?

A
Argon forms molecules when electricity is passed through it

B
Argon is inert and so does not react with the hot filament

C
Argon is less dense than air

D
Argon produces light when it burns

Solution

Solution:- (B) Argon is inert and so does not react with the hot filament
Argon belongs to zero group, i.e., is a noble gas and thus is inert. Hence it will not react with the hot filaments.
Hence it is used in fluorescent and incandescent light bulbs to stop the oxygen in the light bulbs from corroding the hot tungsten filament.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 58

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The p-Block Elements Test - 58

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SHARING IS CARING

Question 1

$$-1$$

$$-2$$

$$-3$$

$$(1)$$ & $$(2)$$

Solution

Question 2

$$ns^{2}np^{6}$$

$$ns^{2}np^{3}$$

$$ns^{2}np^{5}$$

$$ns^{2}$$

Solution

Question 3

Low temperature and high pressure

Low temperature and present pressure

High temperature and low pressure

High temperature and high pressure

Solution

Low temperature

High pressure

Question 4

2, 7

2, 8, 8, 7

2, 8, 7

2, 7, 8

Solution

Question 5

$$Cl_{2}O_{7}$$

$$\mathrm { ClO } _ { 3 } ^ { - }$$

$$\mathrm { CHO } ^ { - }$$

$$\mathrm { ClO } _ { 4 } ^ { - }$$

Solution

Question 6

$$CH_{3}COCH_{3}$$

$$HCHO$$

$$CH_{3}CH_{2}Br$$

$$CH_{3} - O - CH_{3}$$

Solution

Question 7

$$N(SiH_3)_3$$ is planar and more basic than $$N(CH_3)_3$$

$$N(SiH_3)_3$$ is planar and less basic than $$N(CH_3)_3$$

$$N(CH_3)_3$$ is planar and more basic than $$N(SiH_3)_3$$

$$N(CH_3)_3$$ is pyramidal and less basic than $$N(SiH_3)_3$$

Solution

Question 8

Red $$P$$ is toxic

White $$'P'$$ is highly soluble in $$CS_{2}$$

Black $$'P'$$ is thermodynamic is most stable

White $$'P'$$ is soluble in $$NaOH$$ evolves $$PH_{3}$$

Solution

Question 9

Paramagnetic

Anhydride of $$HNO_{2}$$

Brown gas

Exist in solid In form of $$[NO^{+}_{2}][NO_{3}^{-}]$$

Solution

Question 10

Argon forms molecules when electricity is passed through it

Argon is inert and so does not react with the hot filament

Argon is less dense than air

Argon produces light when it burns

Solution

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