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ECAT Chemistry Chapter 12 Periodic Classification of Elements and Periodicity Online Test MCQs With Answers
Question # 1
Variable valency is characteristic of
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Halogen
Transition elements
Alkali metals
Noble gas
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Question # 2
All the elements belongs to the 2nd period are
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Normal elements
Transition elements
Stable elements
Halogens
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Question # 3
What is the nature of Al
2
O
3
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Acidic
Basic
Amphoteric
Neutral
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Question # 4
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 # 5
The alkali metal which is liquid at 15
°C is
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K
Cs
Na
None
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Question # 6
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 # 7
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 # 8
The elements with atomic numbers 9, 17, 35, 53, 85 an all
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Noble gases
Halogens
Heavy metals
Light metals
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Question # 9
In a group form top to bottom, the hardness of alkali metals
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Remains unchanged
Increases
Decreases
None
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Question # 10
Keeping in view the size of atoms, which order is the correct one
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Mg > Sr
Ba > Mg
Lu > Ce
Cl > l
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Question # 11
The oxides of which of the following elements will be acidic in character
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Mg
Rb
Li
Cl
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Question # 12
The valency, ionization energy and electrongativity of elements are related to its
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Atomic number
Properties
Atomic weight
Family group
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Question # 13
Which among the following elements have lowest value of IE
1
?
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Pb
Sn
Si
C
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Question # 14
From
39
Y to
48
Cd are called
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Transition elements
Outer transition elements
Inner transition elements
2nd transition series
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Question # 15
Which among the following species has the highest ionization energy?
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Ne
F
Li
B
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Question # 16
The coinage metals are
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Ni, Pd, Pt
Cu, Ag, Au
Zn, Al, Pb
Fe, Si, Sn
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Question # 17
Which of the following isoelectronic ions has the lowest ionization energy?
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K
+
Ca
2+
Cl
-
S
2-
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Question # 18
Which of the following statement about fluorine is not correct?
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Electron affinity of chlorine is greater than that of fluorine
Bond energy of fluorine is less than that of chlorine
Fluorine cannot be prepared by electrolysis of fused metal fluorides
Fluorine does not form oxoacid
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Question # 19
The number of elements in the first, second and third period are
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2, 8, 18
8, 2, 18
2, 18, 8
2, 8, 8
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Question # 20
From left to right, atomic radii of transition elements
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Increases
Decreases
Remain same
None of the above
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Question # 21
The structure of complex hydrides is
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Tetrahedal
Trigonal
Octahedral
Square planar
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Question # 22
The oxides of electronegative elements are
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Basic
neutral
Acidic
Amphoteric
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Question # 23
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 # 24
Which is the transition element among the following
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B
Al
Cu
Cs
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Question # 25
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 # 26
Which of the following is a member of -block
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Zn
Al
B
Br
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Question # 27
Doberiner arranged the similar elements into
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Pairs
Triads
Triplets
Rows
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Question # 28
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 # 29
The lA elements are called
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Alkaline earth metal
Alkaline metals
The halogens
The inert gases
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Question # 30
Which of the following discoveries resulted in a version of the Mendeleefs
periodic law
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The nucleus of atom by Rutherford
The elements polonium and radium by the Curies
Atomic numbers by Moseley
x-rays by Roentgen
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Question # 31
Which of the following sets of atomic numbers belong to that of the alkali metals?
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1,12,30,4,62
37,19,3,55
9,17,35,53
12,20,56,88
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