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

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IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.
.

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

 

  •  SiO32- Si3O72-
  •  SiO44- Si3O108-
  •  SiO42- Si3O92-
  •  SiO34- Si3O78-
Solution
SiO44- Si3O108-

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

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