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Classification of elements-Class X-Vasu Classes
1.
Which of the following are the properties of Mandleev's classification of elements
a) Gaps for unknown elements
b) Predicted properties of unknown elements
c) Correct order of atomic mass
d) A & B
2.
Eka Boron is named as
a) Scandium
b) Gallium
c) Uranium
d) Germanium
3.
Mandleeve could not explained the position of isotopes as
a) atomic mass was not known at that time
b) atom was considered indivisible
c) atomic number was not known
d) All of the above
e) B and C
4.
Modern basis for the classification of the elements is
a) atomic number
b) similar configuration
c) atomic mass
d) all of the above
e) A and B
5.
Elements of atomic number 57 to 71 are called
a) Transition elements
b) Acitinide series
c) Lanthanide series
d) Halogens
6.
Which of these are correct in modern periodic table
a) Metttalic character decreases in a period left to right
b) Size of atom increases in a period left to right
c) Basic nature of oxides decreases in a period left to right
d) All of the above are correct
e) A and C only
7.
Diagonal elements in modern periodic table are called
a) Transition elements
b) Meattaloids
c) Halogens
d) Inert gases
8.
The atomic numbers of A=2 ,B=10 and C=5 which of these belong to same group
a) A , B
b) B ,C
c) C ,A
d) None
9.
The atomic numbers of X=9 , Y=12 , Z=15 Which of these belong to same period
a) X , Y
b) Y ,Z
c) Z , X
d) All of the above
10.
Arrange Ar , Cl and Al in the increasing order of size
a) Cl ,Ar , Al
b) Al ,Ar ,Cl
c) Cl ,Al ,Ar
d) Ar ,Cl ,AL
11.
Atomic number of X and Y are 17 and 15 respectively ,The bond between them is.. and formula of the compound will be
a) Ionic , X3Y
b) Covalent ,X3Y
c) Covalent , XY3
d) Ionic , XY3
12.
Which one of these elements is smallest in size , if all belong to same period
a) Na
b) Ar
c) Cl
d) Si
13.
Which one of the following pairs does not belong to same group?
a) Cl ,Br
b) N , P
c) Mg , Ca
d) Al , Si
14.
Which of the following statements are true
a) In a valency in a group does not change
b) Size of atom in a group increases bottom to top
c) Mettalic character in a period decrease Left to right
d) A and C
e) B and C
15.
Which of the following are iso electronic?
a) Na+ , Ar
b) Cl- , Ne
c) Mg2+ ,Ne
d) A and B
e) B and C
16.
Which of the following is most non mettalic?
a) Iodine
b) Br
c) Cl
d) F
17.
The atomic number of A=12 ,B=21 ,C=19 , D=20 , E=38 , Which of these elements are identical in chemical properties
a) A ,C,D
b) D ,E ,C
c) A , D , E
d) A ,C ,E
18.
The element Neon is from which group
a) Halogen
b) Rare earth metals
c) Noble gas
d) Non metal
19.
Elemnts present in the same group of periodic table have same
a) Atomic number
b) valence electrons
c) atomic mass
d) atomic size
20.
Which of the following choices is not a family of elements
a) Halogens
b) Alkali metals
c) Noble gases
d) None
21.
How many groups and periods are there in modern periodic talble
a) 18 ,7
b) 7,7
c) 7 ,18
d) 18, 32
22.
First three periods of modern peridoc table are
a) short periods
b) Long periods
c) Moderate periods
d) None
23.
Group number and period of an element having atomic number 16 is
a) 3 rd group 6 th period
b) 6 --2
c) 3 -16
d) 6-3
24.
In a group from top to bottom electron affinity
a) Decreases
b) Increases
c) remains same
d) fluctuate
25.
On moving left to right in a period the chemical recativity
a) decreases then increases
b) increases then decreases
c) Reamains same
d) only increases
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