The Pblock Elements Test

The Pblock Elements

This is the pblock elements Test-01 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Elements having +5 oxidation state is
  • A
    Arsenic
  • B
    Antimony
  • C
    Bismuth
  • D
    Phosphorous
    Correct
2
$\left[ {Ar} \right]{\text{ }}3{d^{10}}4{s^2}4{p^3}$is the electronic configuration of
  • A
    Bismuth
  • B
    Phosphorous
  • C
    Arsenic
    Correct
  • D
    Antimony
3
The most abundant oxidation states of nitrogen are
  • A
    – 3, +3, +5
    Correct
  • B
    – 3, +5
  • C
    +3, +5
  • D
    – 3, +3
4
Which among the following compound, nitrogen shows the oxidation state of +5?
  • A
    $N_2$
  • B
    $HNO_3$
    Correct
  • C
    $NH_3$
  • D
    $NH_2OH$
5
The maximum covalency of nitrogen is
  • A
    Four
    Correct
  • B
    Eight
  • C
    Six
  • D
    Five
6
Which among the following forms basic oxide?
  • A
    Phosphorous
  • B
    Bismuth
    Correct
  • C
    Nitrogen
  • D
    Antimony
7
In laboratory ammonia is prepared by heating
  • A
    Ammonium chloride with sodium hydroxide
    Correct
  • B
    Nitrogen and hydrogen
  • C
    Calcium cyanamide with water
  • D
    Ammonium chloride with calcium hydroxide
8
Ammonia has a higher boiling point and is less volatile because of
  • A
    Dipole – Dipole interaction
  • B
    Covalent bond
  • C
    Vander waal forces
  • D
    Hydrogen bond
    Correct
9
Which compound is used in the preparation of caprolactam?
  • A
    Ammonia
    Correct
  • B
    Phosphorous halide
  • C
    Phosphine
  • D
    Nitric acid
10
Which compound is used as the cooling liquid in refrigerators?
  • A
    Ozone
  • B
    Nitrous oxide
  • C
    Phosphine
  • D
    Ammonia
    Correct
11
Ammonia act as a Lewis base because nitrogen has
  • A
    None of these
  • B
    Lone pair of electrons
    Correct
  • C
    3 electrons in the outermost shell
  • D
    Bond pair of electrons
12
Which allotrope of phosphorous is most stable?
  • A
    Black
    Correct
  • B
    Red
  • C
    Blue
  • D
    White
13
At what temperature white phosphorous changes to red phosphorous?
  • A
    600 $^oC$
  • B
    400$^oC$
  • C
    250$^oC$
    Correct
  • D
    35 $^oC$
14
What is the spontaneous ignition temperature of white phosphorous?
  • A
    35 $^oC$
    Correct
  • B
    15 $^oC$
  • C
    20 $^oC$
  • D
    10 $^oC$
15
is the structure of
Question 15 figure 1
  • A
    Pyrophosphoric acid
  • B
    Phosphoric acid
    Correct
  • C
    Phosphinic acid
  • D
    Phosphorous acid