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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 28
1.
According to Modern Periodic Law "Properties of elements are a periodic function of their atomic_______?
a) Masses
b) Numbers
2.
An atom is spherical like egg.
a) True
b) False
3.
Atomic mass is indirectly proportional to atomic radius.
a) False
b) True
4.
Atomic masses of noble gases were between group one and group seven atomic masses.
a) False
b) True
5.
Chemical behavior of elements depends upon the no of electron present in _______.
a) Outer most shell
b) Inner most shell
c) Any shell
6.
Concept of atomic numbers was based on ______?
a) Properties of elements
b) Position of elements in periodic table
c) Atomic masses of elements
7.
Concept of atomic numbers was introduced by ________?
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8.
Density of nitrogen obtained by heating mixture of sodium nitrate and Ammonium chloride is _____.
a) 0.5% lighter or less
b) 5% lighter or less
c) 5% heavier or more
d) 0.5% heavier or more
9.
Elements having similar electronic configuration in their outer shells have ________.
a) Similar chemical properties
b) No effect on chemical properties
c) Different chemical properties
d) Similar physical properties
10.
Elements in Mendeleef periodic table were arranged in
________________?
a) Ascending order of atomic numbers
b) Ascending order of atomic masses
c) Descending order of atomic numbers
d) Descending order of atomic masses
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