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

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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.In P4 (tetrahedral)
  • Each P is joined to four P
  • Each P is joined to three P
  • Each P is joined to two P
  • P4 does not exist
Solution
Each P is joined to three P
Q2.Carbon and silicon belong to group 14. What is the nature of carbide of silicon?
  •  Covalent
  •  Ionic
  •  Interstitial
  •  None of these
Solution
SiC- Covalent
Q3.AlO2- is known as
  •  Aluminium dioxo ion
  •  Meta aluminate ion
  •  Dioxo aluminium ion
  •  Aluminium oxide ion
Solution
Meta aluminate ion

Q4.Major minerals containing nitrogen are
  •  DNA
  •  RNA
  •  KNO3, NaNO3
  •  All of these
Solution
KNO3,NaNO3
Nitrogen gas makes up about 78% of the atmosphere by volume. There are relatively major
minerals containing nitrogen as nitrates are 'saltpetre' (NaNO3) and KNO3

Q5.Which of the following is/are paramagnetic?
NO2, NO, N2O4, N2O2, N2O5
  •  Only NO2
  •  NO2, NO
  •  NO, NO2, N2O5
  •  All are paramagnetic
Solution
NO and NO2 have unpaired electrons, thus paramagnetic

Q6.Which of the following compounds is/are possible?
  •  B2Cl4, BCl2, Cl2B
  •  GaCl2, GaS
  • Ga[GaCl4].Ga2S2
  •  All of these
Solution
All of these

Q7.Which involves breaking of covalent bonds?
  •  Boiling of H2S
  •  Melting of SiO2
  •  Melting of KCN
  •  Boiling of CCl4
Solution
Melting of SiO2
Silica has a three-dimensional network structure. In silica, silicon is sp3- hybridized and is
thus linked to four oxygen atoms and each oxygen atom is linked to two silicon atoms
forming a three-dimensional giant molecule. This three-dimensional network structure imparts stability to SiO2crystal and hence a large amount of energy is
required to break the crystal resulting in high melting point.
And melting of this breaks covalent bonds between molecules.

Q8.Which of the following is most acidic?
  •  N2O5
  •  P2O5
  •  As2O5
  •  Sb2O5
Solution
N2O5
As among N, P, As and Sb. the former has highest electronegativity (EN) so its oxide is most acidic.
As the electronegativity value of element increases. the acidic character of the oxide also increases.



Q9.Select the correct statement(s)
  •  Si, uses all of its valence electrons in an sp3-hybridisation and crystallizes in an fcc structure similar to diamond
  •  Diamond is an electrical insulator, graphite is an electrical conductor but silicon is a semiconductor
  •  Most common silica is quartz
  •  All of the above are correct statements
Solution
All of the above are correct statements
Q10. In graphite, additional electrons are
  •  Localized on each C-atom
  •  Localized on every third C-atom
  •  Present in anti-bonding orbital
  • Delocalized forming extended π-bonding system
Solution
Delocalised forming extended π-bonding system.
Here each carbon atom is in sp2 hybridised state and is thus attached to three other carbon atoms by three sigma bonds forming a hexagonal planar structure.
The fourth electron present in an unhybridised p−orbital of each carbon atom of a hexagonal unit then overlap with each other to form a pi bond.

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