The P Block Elements CBSE Questions & Answers

The P Block Elements

This is Chemistry Class 11 The p Block Elements CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The angular shape of ozone molecules ($O_3$) consists of
  • A
    1 sigma and 2 pi bonds
  • B
    2 sigma and 2 pi bonds
  • C
    4 sigma and 3 pi bonds
  • D
    2 sigma and 1 pi bonds
    Correct
2
Argon is used
  • A
    In high temperature welding
    Correct
  • B
    In radio therapy for treatment of cancer
  • C
    In filling airships
  • D
    To obtain low temperature
3
Silicon is the second most abundant element on the earth’s crust and is a component of
  • A
    flux for soldering metals
  • B
    antiseptic materials
  • C
    ceramics
    Correct
  • D
    glass wool
4
Carbon is most widely distributed in nature. In combined state it is available as
  • A
    diamond
  • B
    coal
  • C
    graphite
  • D
    hydrocarbons
    Correct
5
Stable isotopes of carbon are
  • A
    \({{\text{C}}^{{\text{12}}}}{\text{and }}{{\text{C}}^{{\text{13}}}}\)
    Correct
  • B
    \({{\text{C}}^{{\text{14}}}}{\text{and }}{{\text{C}}^{{\text{13}}}}\)
  • C
    \({{\text{C}}^{{\text{14}}}}{\text{and }}{{\text{C}}^{{\text{15}}}}\)
  • D
    \({{\text{C}}^{{\text{12}}}}{\text{and }}{{\text{C}}^{{\text{14}}}}\)
6
The elements of group 14 are slightly more electronegative than group 13 elements because of
  • A
    high melting point
  • B
    high boiling point
  • C
    their being liquids
  • D
    small size
    Correct
7
In general, non-metals as compared to metals have
  • A
    higher ionisation enthalpies
    Correct
  • B
    non-metals readily form cations
  • C
    lower covalent charecter of the compounds formed between them
  • D
    lower ionisation enthalpies
8
The compounds formed by highly reactive non-metals with highly reactive metals are generally
  • A
    slightly different in their ionisation enthalpies
  • B
    ionic
    Correct
  • C
    slightly different in their electronegativities
  • D
    covalent
9
The non-metal oxides are:
  • A
    basic or neutral
  • B
    basic or acidic
  • C
    acidic or neutral
    Correct
  • D
    basic
10
The element having the noble gas plus 14 f- electrons plus 10 d-electron cores
  • A
    Aluminium
  • B
    Boron
  • C
    Gallium
  • D
    thallium
    Correct
11
The element having the noble gas plus 10 d-electron cores
  • A
    Aluminium
  • B
    thallium
  • C
    Gallium
    Correct
  • D
    Boron
12
Which of the following is a Lewis acid?
  • A
    \({\text{BaC}}{{\text{l}}_{\text{2}}}\)
  • B
    \({\text{Ca C}}{{\text{l}}_{\text{2}}}\)
  • C
    \({\text{MgC}}{{\text{l}}_{\text{2}}}\)
  • D
    \({\text{AlC}}{{\text{l}}_{\text{3}}}\)
    Correct
13
Which of the following oxides is acidic in nature?
  • A
    \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
    Correct
  • B
    \({\text{I}}{{\text{n}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
  • C
    \({\text{A}}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
  • D
    \({\text{G}}{{\text{a}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
14
One mole of magnesium nitride on the reaction with an excess of water gives:
  • A
    two moles of nitric acid
  • B
    one mole of nitric acid
  • C
    two moles of ammonia
    Correct
  • D
    one mole of ammonia
15
The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in \(\left[ {{\text{Be}}{{\left( {{\text{OH}}} \right)}_{\text{4}}}} \right]\) and the geometry of the complex are respectively
  • A
    \({\text{s}}{{\text{p}}^{\text{3}}},\)tetrahedral
    Correct
  • B
    \({\text{ds}}{{\text{p}}^{\text{2}}}\),square planar
  • C
    \({\text{s}}{{\text{p}}^{\text{3}}},\)square planar
  • D
    \({\text{s}}{{\text{p}}^{\text{3}}}{\text{3d2 }},\)octahedral