Classification Of Elements And Periodicity CBSE Questions & Answers

Classification Of Elements And Periodicity

This is Chemistry Class 11 Classification of Elements and Periodicity CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Of the following complex ions, which is diamagnetic in nature?
  • A
    \({\left[ {{\text{Co}}{{\text{F}}_{\text{6}}}} \right]^{{\text{3}}--}}\)
  • B
    \({\left[ {{\text{CuC}}{{\text{l}}_{\text{4}}}} \right]^{{\text{2}}--}}\)
  • C
    \({\left[ {{\text{NiC}}{{\text{l}}_{\text{4}}}} \right]^{{\text{2}}--}}\)
  • D
    \({\left[ {{\text{Ni}}{{\left( {{\text{CN}}} \right)}_{\text{4}}}} \right]^{{\text{2}}--}}\)
    Correct
2
The characteristic not related to alkali metal is
  • A
    their ions are isoelectronic with noble gas
  • B
    high ionisation energy
    Correct
  • C
    low melting point
  • D
    low electronegativity
3
The correct statement with regard to \(H_2^ + \) and \(H_2^ - \) is
  • A
    Both \(H_2^ + \) and \(H_2^ - \) do not exist
  • B
    \(H_2^ - \)is more stable than \(H_2^ + \)
  • C
    \(H_2^ + \) is more stable than \(H_2^ - \)
    Correct
  • D
    Both \(H_2^ + \) and \(H_2^ - \) are equally stable
4
The magnetic moment of a transition metal ion is \(\sqrt {15} \) B.M. Therefore the number of unpaired electrons present in it is
  • A
    3
    Correct
  • B
    2
  • C
    1
  • D
    4
5
An element with atomic number 21 is a
  • A
    transition element
    Correct
  • B
    alkali metal
  • C
    representative element
  • D
    halogen
6
An element belongs to Group 15 and third period of the periodic table. Its electronic configuration will be
  • A
    \({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{4}}}\)
  • B
    \({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{2}}}\)
  • C
    \({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{3}}}\)
  • D
    \({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{3}}}\)
    Correct
7
In which one of the given formulae of xenon compounds there are five \(\alpha - \)bonds and three π-bonds in it?
  • A
    \({\text{XeFO}}\)
  • B
    \({\text{Xe}}{{\text{F}}_{\text{2}}}{{\text{O}}_{\text{2}}}\)
  • C
    \({\text{Xe}}{{\text{F}}_{\text{3}}}{{\text{O}}_{\text{2}}}\)
  • D
    \({\text{Xe}}{{\text{F}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
    Correct
8
Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in
  • A
    increasing order of their atomic weights
    Correct
  • B
    decreasing order of their atomic weights
  • C
    increasing order of their atomic numbers
  • D
    decreasing order of their atomic numbers
9
A transition metal ion exists in its highest oxidation state. It is expected to behave as
  • A
    a chelating agent
  • B
    a central metal in a coordination compound
  • C
    an oxidising agent
    Correct
  • D
    a reducing agent
10
Which of the following statements is false?
  • A
    Alkali metals have relatively low first ionization energies
  • B
    Alkali metals forms oxides that act as basic anhydrides.
  • C
    Alkali metals usually have a +1 oxidation state
  • D
    Alkali metals form covalent bonds with oxygen.
    Correct
11
Which of the species in the given category below will have the largest and the smallest size? \({\text{Mg}},{\text{ M}}{{\text{g}}^{{\text{2}} + }},{\text{ Al}},{\text{ A}}{{\text{l}}^{{\text{3}} + }}\)
  • A
    \({\text{M}}{{\text{g}}^{{\text{2}} + }},{\text{ Al}}\)
  • B
    \({\text{Mg}},{\text{ A}}{{\text{l}}^{{\text{3}} + }}\)
    Correct
  • C
    \({\text{A}}{{\text{l}}^{{\text{3}} + }},{\text{ Mg}}\)
  • D
    \({\text{A}}{{\text{l}}^{{\text{3}} + }},{\text{ M}}{{\text{g}}^{{\text{2}} + }}\)
12
Which of the following will have the most negative electron gain enthalpy and which one the least negative? P, S, Cl, F.
  • A
    P,S
  • B
    P,Cl
  • C
    P,Cl
  • D
    Cl, P
    Correct
13
s-Block Elements comprise
  • A
    Group 3 and Group 2
  • B
    Group 1 (alkali metals) and Group 2 (alkaline earth metals)
    Correct
  • C
    Group 4 (alkali metals) and Group 7 (alkaline earth metals)
  • D
    Group 1 and Group 4
14
It is now recognized that the ‘Modern Periodic Law’ is essentially the consequence of the
  • A
    periodic variations in the element lattice
  • B
    periodic variation in chemical bonds
  • C
    periodic variation in electronic configurations
    Correct
  • D
    periodic variation in chemical properties
15
Considering the elements F, Cl, O and N, the correct order of their chemical reactivity in terms of oxidizing property is
  • A
    F > O > Cl > N
    Correct
  • B
    Cl > F > O > N
  • C
    O > F > N > Cl
  • D
    F > Cl > O > N