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 valence shell electronic configuration of p-block elements is ns2np1-6. But this is not true in the case of
  • A
    carbon
  • B
    Boron
  • C
    nitrogen
  • D
    helium
    Correct
2
There are six groups of p-block elements in the periodic table numbering from
  • A
    12 to 17
  • B
    11 to 16
  • C
    13 to 18
    Correct
  • D
    14 to 19
3
The variation in properties in a group of p-block of elements is due to
  • A
    difference in oxidation states
  • B
    difference in electronegativities
  • C
    difference in ionisation enthalpies
  • D
    difference in inner core of the electronic configuration
    Correct
4
The maximum oxidation state shown by a p-block element is
  • A
    half of the sum of the s and p-electrons
  • B
    the sum of the s and p-electrons
    Correct
  • C
    the sum of the p-electrons
  • D
    the sum of the s electrons
5
The sum of the s and p-electrons is called
  • A
    the group oxidation state of p-block elements
    Correct
  • B
    the most stable valence number of p-block elements
  • C
    the most unstable valence number of p-block elements
  • D
    inert pair of p-block elements
6
Inert pair effect of p-block elements is due to the
  • A
    the most stable valence number of p-block elements
  • B
    the oxidation state two unit less than the group oxidation state
    Correct
  • C
    the most unstable valence number of p-block elements
  • D
    the group oxidation state of p-block elements
7
Among the following which is the strongest oxidizing agent?
  • A
    $Cl_2$
  • B
    $Br_2$
  • C
    $I_2$
  • D
    $F_2$
    Correct
8
As we move from B to Al in the p-block elements the sum of the first three ionisation enthalpies
  • A
    remains the same
  • B
    increases
  • C
    slightly decreases
  • D
    considerably decreases
    Correct
9
Boron forms only covalent compounds and not +3 ions because
  • A
    the sum of its first three ionization enthalpies is very high.
    Correct
  • B
    the sum of its first three ionization enthalpies is very low.
  • C
    the sum of its first two ionization enthalpies is very low.
  • D
    the sum of its first two ionization enthalpies is very high.
10
One of the following p-block elements has unusually low melting point
  • A
    boron
  • B
    gallium
    Correct
  • C
    Indium
  • D
    aluminium
11
One of the following p-block elements in group 13 could exist in liquid state during summer
  • A
    Indium
  • B
    boron
  • C
    aluminium
  • D
    gallium
    Correct
12
The relative stability of +1 oxidation state progressively increases for heavier elements. Choose one of the following options.
  • A
    Al<Ga<In<Tl
    Correct
  • B
    Tl<Al< Al<Ga
  • C
    In<Tl<Al<Ga
  • D
    Ga<In<Tl<Al
13
Aluminium when exposed to air protects itself from further attack by
  • A
    reacting with air and liberating dihydrogen
  • B
    forming a very thin oxide layer on its surface
    Correct
  • C
    forming aluminium trioxide
  • D
    reacting with hydrogen in the air
14
White fumes appear around the bottle of anhydrous aluminium chloride.Why?
  • A
    Formation of HCl on reaction with atmospheric moisture and then Aluminium dissolves in dilute HCl and liberates dihydrogen
  • B
    Formation of dihydrogen on reaction with atmospheric moisture
  • C
    liberation of HCl on reaction with atmospheric moisture
    Correct
  • D
    Formation of HCl on reaction with atmospheric moisture and then Aluminium reacts with dilute HCl and forms aluminium chloride
15
Diborane is produced on an industrial scale by the reaction of BF3 with
  • A
    \({\text{LiB}}{{\text{H}}_{\text{4}}}\)
  • B
    \({\text{NaB}}{{\text{H}}_{\text{4}}}\)
  • C
    sodium hydride
    Correct
  • D
    diethyl ether