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
Among the following which is the strongest oxidizing agent?
  • A
    \({\text{B}}{{\text{r}}_{\text{2}}}\)
  • B
    \({{\text{I}}_{\text{2}}}\)
  • C
    \({\text{C}}{{\text{l}}_{\text{2}}}\)
  • D
    \({{\text{F}}_{\text{2}}}\)
    Correct
2
The brown ring test for nitrates depends on
  • A
    the reduction of ferrous sulphate to iron
  • B
    oxidation of nitric oxide to nitrogen dioxide
  • C
    reduction of nitrate to nitric oxide
    Correct
  • D
    oxidising action of sulphuric acid
3
One mole of magnesium nitride on the reaction with an excess of water gives:
  • A
    two moles of nitric acid
  • B
    two moles of ammonia
    Correct
  • C
    one mole of ammonia
  • D
    one mole of nitric acid
4
Which of the following statements is not valid for oxoacids of phosphorus?
  • A
    All oxoacids contain at least one P = O unit and one P – OH group
  • B
    Hypophosphorous acid is a diprotic acid
    Correct
  • C
    Orthophosphoric acid is used in the manufacture of triple superphosphate
  • D
    All oxoacids contain tetrahedral four coordinated phosphorus
5
Sulphur trioxide can be obtained by which of the following reaction
  • A
    \({\text{S }} + {\text{ }}{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\)\(\rightarrow{\Delta }\)
  • B
    \({\text{F}}{{\text{e}}_{\text{2}}}{\left( {{\text{S}}{{\text{O}}_{\text{4}}}} \right)_{\text{3}}}\)\(\rightarrow{\Delta }\)
  • C
    \({{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}} + {\text{ PC}}{{\text{l}}_{\text{3}}}\)\(\rightarrow{\Delta }\)
  • D
    \({\text{CaS}}{{\text{O}}_{\text{4}}} + {\text{ C}} \)\(\rightarrow{\Delta }\)
    Correct
6
Argon is used
  • A
    In radio therapy for treatment of cancer
  • B
    In filling airships
  • C
    To obtain low temperature
  • D
    In high temperature welding
    Correct
7
The function of \({\text{Fe }}{\left( {{\text{OH}}} \right)_{\text{3}}}\) in the contact process is
  • A
    to remove dust particles
  • B
    to remove arsenic impurity
    Correct
  • C
    to remove moisture
  • D
    to detect colloidal impurity
8
Of the following compounds the most acidic is
  • A
    \({\text{S}}{{\text{b}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
  • B
    \({{\text{P}}_{\text{2}}}{{\text{O}}_{\text{5}}}\)
    Correct
  • C
    \({\text{A}}{{\text{s}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
  • D
    \({\text{B}}{{\text{i}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
9
Atoms in a \({{\text{P}}_{\text{4}}}\) molecule of white phosphorus are arranged regularly in the following way
  • A
    at the corners of the octahedron
  • B
    at the corners of a tetrahedron
    Correct
  • C
    at the centre and corners of a tetrahedron
  • D
    at the corners of the cube
10
Aqueous solution of \({\text{N}}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{3}}}\) on reaction with \({\text{C}}{{\text{l}}_{\text{2}}}\) gives
  • A
    \({\text{N}}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{4}}}{{\text{O}}_{\text{6}}}\)
  • B
    \({\text{NaHS}}{{\text{O}}_{\text{4}}}\)
    Correct
  • C
    NaOH
  • D
    NaCl
11
The angular shape of ozone molecules \(\left( {{{\text{O}}_{\text{3}}}} \right)\) consists of
  • A
    None of these
  • B
    2 sigma and 1 pi bonds
    Correct
  • C
    2 sigma and 2 pi bonds
  • D
    1 sigma and 2 pi bonds
12
Which one of the following arrangement does not give the correct picture of the trends indicated against it?
  • A
    \({{\text{F}}_{\text{2}}} > {\text{ C}}{{\text{l}}_{\text{2}}} > {\text{ B}}{{\text{r}}_{\text{2}}} > {\text{ }}{{\text{I}}_{\text{2}}}\): Electron gain enthalpy
  • B
    \({{\text{F}}_{\text{2}}} > {\text{ C}}{{\text{l}}_{\text{2}}} > {\text{ B}}{{\text{r}}_{\text{2}}} > {\text{ }}{{\text{I}}_{\text{2}}}\) : Bond dissociation energy
    Correct
  • C
    \({{\text{F}}_{\text{2}}} > {\text{ C}}{{\text{l}}_{\text{2}}} > {\text{ B}}{{\text{r}}_{\text{2}}} > {\text{ }}{{\text{I}}_{\text{2}}}\): Oxidizing power
  • D
    \({{\text{F}}_{\text{2}}} > {\text{ C}}{{\text{l}}_{\text{2}}} > {\text{ B}}{{\text{r}}_{\text{2}}} > {\text{ }}{{\text{I}}_{\text{2}}}\): Electronegativity
13
Four species are listed below: A. HC\(o_3^ - \) B. \({{\text{H}}_{\text{3}}}{{\text{O}}^ + }\)C. HS\(o_4^ - \) D. \({\text{HS}}{{\text{O}}_{\text{3}}}{\text{F}}\)Which one of the following is the correct sequence of their acidic strength?
  • A
    \({\text{i }} < {\text{ iii }} < {\text{ ii }} < {\text{ iv}}\)
    Correct
  • B
    \({\text{iv }} < {\text{ ii }} < {\text{ iii }} < {\text{ i}}\)
  • C
    \({\text{iii }} < {\text{ I }} < {\text{ iv }} < {\text{ ii}}\)
  • D
    \({\text{ii }} < {\text{ iii }} < {\text{ I }} < {\text{ iv}}\)
14
Helium is used in balloons in place of hydrogen because it is
  • A
    radioactive
  • B
    lighter than hydrogen
  • C
    incombustible
    Correct
  • D
    more abundant than hydrogen
15
Which is most easily liquefiable rare gas?
  • A
    Kr
  • B
    Xe
    Correct
  • C
    Ne
  • D
    Ar