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CHEMISTRY THE P-BLOCK ELEMENTS-11th
QUIZ-10

Dear Readers,

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.Orthoboric acid H3BO3 behaves as weak monobasic acid giving H3O+ and
  • H2BO2+
  • H2BO2-
  • [B(OH)4]-
  • [B(OH)4]+
Solution
B(OH)3 + 2H2O → [B(OH)4]- + H3O+
Q2.Soda free glass fibre are made of
  •  H3BO3, B2O3 and Ca3(BO3)2
  •  H3BO3, B2O3
  •  H3BO3
  •  B2O3
Solution
H3BO3, B2O3 and Ca3(BO3)2
Q3.Select the correct statement(s) about H3BO3
  •  It has triangular BO33- units
  •  In solid states, molecules are hydrogen bonded
  •  Both (a) and (b) are correct
  •  None of the above statements is correct
Solution
Both (a) and (b) are correct

Q4.Which gas is used in aerated water?
  •  CO2
  •  SO2
  •  CO
  •  Water vapours
Solution
CO2 + H2O ⇌ H2CO3

Q5.Red and white phosphorus will differ but not in
  •  Smell
  •  Solubility in CHCl3
  •  Exhibiting phosphorescence
  •  Reactions with HNO3
Solution
Reactions with HNO3

Q6.Which of the following have the highest melting points?
  •  p-block elements
  •  s-block elements
  • d-block elements
  •  All have equal melting points
Solution
d− block elements have highest melting points as they can form covalent bonds due to incompletely filled d orbitals.
They melt above 1000oC

Q7.Green house effect is due to
  •  Disturbance of the earth’s delicate thermal balance
  •  Absorption of heat radiation by atmospheric gases particularly water vapours
  •  Both (a) and (b)
  •  None of the above
Solution
absorption of heat radiation by atmospheric gases particularly water vapours.
The greenhouse effect is a natural process that warms the earth's surface. When the Sun's
energy reaches the earth's atmosphere, some of it is reflected back to space and the rest is
absorbed and re-radiated by greenhouse gases.
Greenhouse gases include water vapour, carbon dioxide, methane, nitrous oxide, ozone and
some artificial chemicals such as chlorofluorocarbons (CFCs)

Q8.In B2H6
  •  There is direct boron-boron bond
  •  The B-H bonds are ionic
  •  It is isostructural to C2H6
  •  Boron atoms are linked through hydrogen bridges
Solution
Two hydrogens atoms act as bridged hydrogen atoms and involved in the formation of three centre-two electrons bonds.


Q9.Borax is converted into B by steps
Borax I → H3BO3 ∆ → B2O3 II → B
I and II reagents are
  •  Acid, Al
  •  Acid, C
  •  Acid, Fe
  •  Acid, Mg
Solution
Borax H+ → H3BO3 ∆ → B2O3 Mg → B
Q10. Ambidentate ligands are
  •  NO2-
  •  CN-
  •  CNS-
  • All of these
Solution
All of these

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