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
In terms of period and group where would you locate the element with Z=114 in the periodic table?
  • A
    7 period and 4 group
    Correct
  • B
    7 period and 3 group
  • C
    6 period and 4 group
  • D
    8 period and 4 group
2
An ionic compound is expected to have tetrahedral structure if \(\frac{{{r_ + }}}{{{r_ - }}}\) lies in the range of
  • A
    0.225 to 0.414
    Correct
  • B
    0.155 to 0.225
  • C
    0.414 to 0.732
  • D
    0.732 to 1
3
The relative tendency of an atom in a molecule to attract the shared pair of electrons towards itself is termed as its
  • A
    electro-positivivity
  • B
    ionisation enthalpy
  • C
    electro-negativity
    Correct
  • D
    electron gain enthalpy
4
The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons is:
  • A
    f > p > s > d
  • B
    p < d < s > f
  • C
    s > p > d > f
    Correct
  • D
    f > d > p > s
5
Which of the following is not an actinoid?
  • A
    Californium (Z = 98)
  • B
    Terbium (Z = 65)
    Correct
  • C
    Curium (Z = 96)
  • D
    Uranium (Z = 92)
6
A transition metal ion exists in its highest oxidation state. It is expected to behave as
  • A
    a central metal in a coordination compound
  • B
    an oxidising agent
    Correct
  • C
    a reducing agent
  • D
    a chelating agent
7
Among the alkali metals cesium is the most reactive because
  • A
    the outermost electron is more loosely bound than the outermost electron of the other alkali metals
    Correct
  • B
    it has a single electron in the valence shell
  • C
    it is the heaviest alkali metal
  • D
    its incomplete shell is nearest to the nucleus
8
The effective distance from the centre of the nucleus of an ion upto which it has an influence on its electron cloud is called its
  • A
    ionic radius
    Correct
  • B
    metallic radius
  • C
    van der waals’radius
  • D
    covalent radius
9
For alkali metals, which one of the following trends is INCORRECT?
  • A
    Atomic size: Li < Na < K < Rb
  • B
    Ionization energy: Li > Na > K > Rb
  • C
    Hydration energy: Li > Na > K > Rb
  • D
    Density: Li < Na < K < Rb
    Correct
10
For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)
  • A
    Mn > Fe > Cr > Co
    Correct
  • B
    Fe > Mn > Co > Cr
  • C
    Cr > Mn > Co > Fe
  • D
    Co > Mn > Fe > Cr
11
Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is ______.
  • A
    Mg and Al
  • B
    N and O
  • C
    Be and B
  • D
    Na and Mg
    Correct
12
In the periodic table, Nitrogen is placed in group 5b, it ranks which position ?
  • A
    First
  • B
    Third
    Correct
  • C
    Fourth
  • D
    Second
13
Which of the following is a 'Metalloid'?
  • A
    Antimony
    Correct
  • B
    Phosphorus
  • C
    Nitrogen
  • D
    Bismuth
14
In the periodic table metals usually used as catalysts belong to
  • A
    f – block
  • B
    p - block
  • C
    d - block
    Correct
  • D
    s - block
15
\({\text{M}}{{\text{g}}^{ + {\text{2}}}}\) is isoelectronic with
  • A
    \({\text{C}}{{\text{u}}^{{\text{2}} + }}\)
  • B
    \({\text{C}}{{\text{a}}^{{\text{2}} + }}\)
  • C
    \({\text{Z}}{{\text{n}}^{{\text{2}} + }}\)
  • D
    \({\text{N}}{{\text{a}}^ + }\)
    Correct