p-Block Elements Test

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p-Block Elements Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Elements having +5 oxidation state is

A
Bismuth

B
Arsenic

C
Antimony

D
Phosphorous

Solution

The maximum oxidation state shown by a p-block element is equal to the total number of valence electrons (i.e., the sum of the s and p-electrons).

P:[Ne]3s²3p³. Total valence electrons =5 so it will show +5 oxidation state. The stability of +5 oxidation state decreases down the group due to inert pair effect.
Question 2
1 / -0

In laboratory ammonia is prepared by heating

A
Ammonium chloride with calcium hydroxide

B
Ammonium chloride with sodium hydroxide

C
Nitrogen and hydrogen

D
Calcium cyanamide with water

Solution

On a small scale ammonia can be prepared by treating ammonium chloride or ammonium sulphate with sodium hydroxide or calcium hydroxide. It is also prepared by hydrolysis of magnesium nitride.

NH₄Cl+NaOH→NH₃+NaCl+H₂O
Question 3
1 / -0

In earlier days of photography, strong ammonia solution was used to dissolve unchanged AgBr. In photographic 'fixing', nowadays, ammonia has been replaced by Na₂S₂O₃ because

A
Na₂S₂O₃ is a solid and is easy to handle as compared to ammonia

B
Na₂S₂O₃ is cheaper than ammonia

C
Na₂S₂O₃gives better quality pictures than ammonia

D
ammonia is harmful and unpleasant to the photographer in confined space of darkroom
Question 4
1 / -0

The maximum covalency of nitroge

A
Five

B
Eight

C
Six

D
Four

Solution

N has maximum covalency of 4 since only four (one s and three p) orbitals are available for bonding. d orbitals are not available for bonding.
Question 5
1 / -0

Fluorine cannot show oxidation state other than - 1 because

A
it is the most electronegative element and has no vacant d-orbital

B
it is small in size

C
it cannot form covalent bonds because of its highest electronegativity

D
its atomic volume is very small
Question 6
1 / -0

The most common oxidation states of nitrogen are

A
– 3, +3, +5

B
– 3, +3

C
+3, +5

D
– 3, +5

Solution

N shows -3 in NH₃, +3 in HNO₂ and +5 in HNO₃.
Question 7
1 / -0

The most favourable condition for the manufacture of NH₃ is

A
high temperature and high pressure

B
low temperature and low pressure

C
high temperature and low pressure

D
low temperature and high pressure
Question 8
1 / -0

Which of the following is the most acidic?

A
P₂O₃

B
Sb₂O₃

C
B₂O₃

D
As₂O₃
Question 9
1 / -0

Xenon can form XeF₄, but He, Ne or Ar cannot form tetrafluorides because

A
ionisation energy of He, Ne and Ar is much higher than that of Xe

B
sizes of He, Ne and Ar are comparable to the size of fluorine, but that of Xe is much bigger

C
electropositivity of Xe is much higher than that of He, Ne and Ar

D
only Xe amongst these has a vacant d-orbital
Question 10
1 / -0

Upon hydrolysis, S₂Cl₂ slowly forms HCl, SO₂ and 'X'. Which of the following is 'X'?

A
SO₃

B
H₂

C
O₂

D
S

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p-Block Elements Test - 1

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Question 1

Bismuth

Arsenic

Antimony

Phosphorous

Solution

Question 2

Ammonium chloride with calcium hydroxide

Ammonium chloride with sodium hydroxide

Nitrogen and hydrogen

Calcium cyanamide with water

Solution

Question 3

Na2S2O3 is a solid and is easy to handle as compared to ammonia

Na2S2O3 is cheaper than ammonia

Na2S2O3 gives better quality pictures than ammonia

ammonia is harmful and unpleasant to the photographer in confined space of darkroom

Question 4

Five

Eight

Six

Four

Solution

Question 5

it is the most electronegative element and has no vacant d-orbital

it is small in size

it cannot form covalent bonds because of its highest electronegativity

its atomic volume is very small

Question 6

– 3, +3, +5

– 3, +3

+3, +5

– 3, +5

Solution

Question 7

high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and high pressure

Question 8

P2O3

Sb2O3

B2O3

As2O3

Question 9

ionisation energy of He, Ne and Ar is much higher than that of Xe

sizes of He, Ne and Ar are comparable to the size of fluorine, but that of Xe is much bigger

electropositivity of Xe is much higher than that of He, Ne and Ar

only Xe amongst these has a vacant d-orbital

Question 10

SO3

H2

O2

S

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Na₂S₂O₃ is a solid and is easy to handle as compared to ammonia

Na₂S₂O₃ is cheaper than ammonia

Na₂S₂O₃gives better quality pictures than ammonia

P₂O₃

Sb₂O₃

B₂O₃

As₂O₃

SO₃

H₂

O₂