p-Block Elements Test

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p-Block Elements Test - 11

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Weekly Quiz Competition

Question 1
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Which of the following is the correct statement?

A
Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

B
Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³ orbital and is more directional.

C
Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³ orbital and is more directional.

D
Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Solution

NH₃ is a better electron donor than PH₃ because the lone pair of electron occupies sp³orbital formed from the more compact 2s and 2p orbitals as compared to 3s and 3p orbitals of phosphorous in PH_3.
Question 2
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Which of the following statements regarding the study of oxides of nitrogen is/are correct?

(i) Except N₂O₅, all oxides of nitrogenare endothermic as a large amount of energy is required to dissociate the stable molecules of oxygen and nitrogen.
(ii) Due to small electronegativity difference, N-O bond can be easily broken. Therefore, oxides of nitrogen are good reducing agents.
(iii) N₂O₃ is stable at only higher temperature.
(iv) All oxides of nitrogen are acidic in nature, except N₂O and NO.

A
Only (i)

B
(i) and (iv)

C
(i) and (ii)

D
All of these

Solution

(ii) Due to small electronegativity difference, N-O bond is easily breakable. Therefore, oxides of nitrogen are said to be better oxidising agents. Hence, (ii) is wrong.
(iii) N₂O₃ is stable at only lower temperature. Hence, (iii) is wrong.
N₂O₅ is a stable oxide of nitrogen.
N₂O and NO are neutral oxides.
Hence, statements (i) and (iv) are correct.
Question 3
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The most stable allotropic form of phosphorus, which has graphite like structure and is good conductor of electricity, is

A
red phosphorous

B
white phosphorous

C
black phosphorous

D
scarlet phosphorous

Solution

Black phosphorus is very much like graphite with both being black and flaky. It is a conductor of electricity and has puckered sheets of linked atoms.
Question 4
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Statement (I) - The order of densities of the various allotropes of phosphorous is: Black phosphorous > red phosphorous > white phosphorous.
Statement (II) - The density of various allotropes of phosphorous depends upon tendency of polymerization.

Which of the following options is correct?

A
Both statements (I) and (II) are correct and statement (II) is the correct explanation of statement (I).

B
Both statements (I) and (II) are correct and statement (II) is not correct explanation of statement (I).

C
Statements (I) is correct while statement (II) is incorrect.

D
Both statements (I) and (II) are incorrect.

Solution

As the tendency of polymerization increases, the compactness also increases. White phosphorous occurs as discrete molecules, red phosphorous is a linear chain polymer while black phosphorous has a layered structure like graphite.
Question 5
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The expected products and the nature of the reaction when phosphine gas is mixed with Cl₂ gas respectively are

A
PCl₃ and HCl, exothermic

B
PCl₃ and HCl, endothermic

C
PCl₂and H₂, no change in temperature

D
No reaction is possible

Solution

PH₃ is highly poisonous as it explodes with traces of oxidizing agent like HNO_3,Cl₂ and Br₂ vapours.
PH₃ + 3Cl₂ → PCl₃ + 3HCl; ΔH = -ve

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p-Block Elements Test - 11

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p-Block Elements Test - 11

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Question 1

Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Between NH3 and PH3, PH3 is a better electron donor because the lone pair of electrons occupies spherical sp3 orbital and is more directional.

Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies spherical sp3 orbital and is more directional.

Between NH3 and PH3, PH3 is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Solution

Question 2

Only (i)

(i) and (iv)

(i) and (ii)

All of these

Solution

Question 3

red phosphorous

white phosphorous

black phosphorous

scarlet phosphorous

Solution

Question 4

Both statements (I) and (II) are correct and statement (II) is the correct explanation of statement (I).

Both statements (I) and (II) are correct and statement (II) is not correct explanation of statement (I).

Statements (I) is correct while statement (II) is incorrect.

Both statements (I) and (II) are incorrect.

Solution

Question 5

PCl3 and HCl, exothermic

PCl3 and HCl, endothermic

PCl2 and H2, no change in temperature

No reaction is possible

Solution

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Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³ orbital and is more directional.

Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³ orbital and is more directional.

Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

PCl₃ and HCl, exothermic

PCl₃ and HCl, endothermic

PCl₂and H₂, no change in temperature