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Online Tests
ECAT Chemistry Chapter 12 Periodic Classification of Elements and Periodicity Online Test MCQs With Answers
Question # 1
The element with highest electron affinity among the halogen is
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F
Cl
Br
I
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Question # 2
Gradual addition of electronic shells in the nobel gases causes a decrease in their
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Ionization energy
Atomic radius
Boiling point
Density
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Question # 3
According to Mendeleev, the properties of the elements are periodic function of their
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Atomic number
Atomic volumes
Atomic masses
Atomic densities
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Question # 4
In the modern periodic table the elements are placed in the ascending order of their
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Atomic masses
Melting points
Boiling points
Atomic numbers
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Question # 5
Which of the following pairs are chemically dissimilar?
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Na and K
Ba and Sr
Zr and Hf
Ca and Zn
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Question # 6
Rare earth elements are
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s-block elements
p-block elements
d-block elements
f-block elements
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Question # 7
Ionization potential increases in moving from left to right in a period
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Because nuclear charge increase
Because atomic size decrease
Both (a) and (b)
Because atomic size increases
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Question # 8
Which is true about the electronegativity order of the following?
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P > Si
C > N
Br > Cl
Sr > Ca
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Question # 9
NaH is
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Ionic hydride
Complex hydride
Covalent hydride
Interstitial hydride
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Question # 10
How does the ionization energy of 1st group elements vary?
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Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular
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Question # 11
Which among the following species has the highest ionization energy?
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Ne
F
Li
B
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Question # 12
The oxides of electronegative elements are
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Basic
neutral
Acidic
Amphoteric
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Question # 13
Which of the following elements have the largest radius
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F
Cl
Br
l
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Question # 14
The chloride of element Q is hydrolysed by water to form an acidic solution and its oxide reacts with acid to form a salt.
What cold be the element Q
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Magnesium
Aluminium
Silicon
Phosphorus
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Question # 15
Indicate the correct statement
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All lanthanidees are present in the same group
All halogens are present in the same period
All the alkali metals are present in the same group
All the noble gases are present int he same period
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Question # 16
The correct order of 2nd l.P. of C,N,O and F is
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O > F > N > C
O > N > F > C
C > N > O > F
F > O > N > C
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Question # 17
Who gave the concept of atomic number
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Newton
Mosley
Dalton
Newland
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Question # 18
Variable valency is characteristic of
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Halogen
Transition elements
Alkali metals
Noble gas
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Question # 19
The amount of energy required to remove an electron from an atom of an element in the gaseous state is called
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Electron affinity
Electronegatively
Ionization energy
None of these
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Question # 20
Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride
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The ionic radius of the NH
4
+
ion is similar to that of Mg
2+
but not that of Na
+
NH
4
Cl dissociates less fully than NaCl
The ions Na
+
and Mg
2+
are isoelectronic (have the same number of electrons)
The ion NH
+
4
acts as an acid
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Question # 21
Which of the following is an inert gas?
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H
2
O
2
N
2
Argon
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Question # 22
In the modern long form of the periodic table elements are arranged in the increasing order of
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Atomic mass
Atomic number
Mass number
Isotopic number
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Question # 23
Which of the following elements should be the least metallic in character
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Rb
ln
Te
l
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Question # 24
Each vertical column of the periodic table includes elements with chemical characteristics that are in general
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Identical
Similar
Different
Similar as well as different
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Question # 25
The atomic radius increases as we move down a group because
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Effective nuclear charge increases
Atomic mass increases
Additive electrons are accommodated in new electron level
Atomic number increases
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Question # 26
The electropositive elements from
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Acidic oxides
Basic oxides
Neutral oxides
None
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Question # 27
Number of elements present in 5th period is
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8
18
32
24
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Question # 28
Elements in the same family have
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Same atomic number
Molecular wt same
Same chemical properties
Same electronic configuration
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Question # 29
Alkali metals in each period have
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Smallest size
Lowest IE
Highest IE
Highest electronegativity
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Question # 30
Which of the following does not exhibit the periodicity in properties of the elements?
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Ionisation energy
N/P ratio
Electronegativity
Atomic radius
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