THE P-BLOCK ELEMENTS-11th Quiz-21

CHEMISTRY THE P-BLOCK ELEMENTS-11th
QUIZ-21

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Q1. Above equilibrium indicates that

• H₂O is a Lowry-Bronsted acid
• H₂O is a Lowry-Bronsted base
• H₂O is a Lowry-Bronsted acid as well as a base
• H₂O is neither acid nor base

Solution
H₂O is a Lowry-Bronsted acid as well as a base

Q2.Bonding electrons involved

•  In B₂H₆ is 14 and in C₂H₆ is 16
•  In B₂H₆ is 12 and in C₂H₆ is 14
•  In B₂H₆ is 10 and in C₂H₆ is 12
•  In B₂H₆ is 16 and in C₂H₆ is 18

Solution
In B₂H₆ is 12 and in C₂H₆ is 14

Q3.Newly discovered allotrope of carbon has the form

•  Polyyne
•  Fullerene
•  Buckyball
•  None of these

Solution
Polyyne

Q4.The following pictures represent various silicate anions. Their formulae are respectively

 

•  SiO₃^2- Si₃O₇^2-
•  SiO₄^4- Si₃O₁₀^8-
•  SiO₄^2- Si₃O₉^2-
•  SiO₃^4- Si₃O₇^8-

Solution
SiO₄^4- Si₃O₁₀^8-

Q5.CO₂ is formed as a result of

•  reaction between Al³⁺ and HCO₃^-
•  Reaction between hydrolysis product of Al³⁺ and HCO₃^-
•  Reaction between hydrolysis product of NaHCO₃ and Al₂(SO₄)₃
•  Direct reaction between Al₂(SO₄)₃ and NaHCO₃

Solution
Reaction between hydrolysis product of Al³⁺ and HCO₃^-

Q6.As a result of green house effect, there can be
A: increase in rate of evaporation of water, thus, untimely more rain, flooding, etc
B: tropical storms in certain parts of the world
C: decrease in pH of the soil
D: increase in pH of the soil

•  B, C, D
•  A, C, D
• A, B, D
•  A, B, C

Solution
A, B, C

Q7.If we mix SiMe₃Cl with SiMe₂Cl₂, we get silicones of the type

•  

   

  
  
•  

   

  
  
•  Both (a) and (b)
•  None of the above

Solution

 

When Me₃SiCl is mixed with Me₂SiCl₂ silicones of the type Me₃Si−O−Si(Me₂)−O−Si(Me₂)−OSiMe₃ are obtained.
Each of the terminal silicon atom carries three methyl groups and each of the middle silicon atom carries two methyl groups.

Q8.Structures of N(CH₃)₃ and N(SiH₃)₃ are different. It is due to the fact that

•  Silicone also uses d-orbitals in multiple bonding
•  In case of N(SiH₃)₃, lone pair of N-atom is transferred to the empty d-orbitals of silicon (pπ-dπ overlapping)
•  Both (a) and (b)
•  None of the above

Solution
Both (a) and (b)
Si has vacant d-orbitals so in case of N(SiH₃)₃ , lone pair N-atom is transferred to the empty d-orbitals of silicon (pπ−dπ overlapping) so it has planar structure but there is no such bond in N(CH₃)₃

Q9.

Which line of entry describes the undefined reagents ,products and reaction conditions?

•  A = Catalyst; B = cool air(-25℃);C = NO₂
•  A = Catalyst; B = cool air(-25℃);C = N₂O
•  A = Catalyst; B = high presssure;C = NO₂
•  A = High Pressure; B = Catalyst;C = N₂O₃

Solution
A = Catalyst; B = cool air(-25℃);C = NO₂

Q10. Equivalent mass of N₂H₄ (molar mass = 32 g mol^-1) is

•  32
•  16
•  48
• 24

Solution
16 is the equivalent mass of N₂H₄