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Chemistry - 9 Chapter - 3
Atomic Structure
Test - 16
1.
Examples of mono isotopic atoms are fluorine, sodium and dominium.
a) True
b) False
2.
Chemical formula of heavy water is.
a) D
2
O
b) H
2
O
c) T
2
O
3.
Molecular mass of heavy water is less than light water.
a) True
b) False
4.
Density of heavy water is more than light water.
a) False
b) True
5.
Melting and boiling points of heavy water are higher than light water.
a) True
b) False
6.
An electron behave as a particle as well as a _________.
a) Wave
b) Atom
c) Ball
7.
Formula to find out number of electron in an orbits is?
a) N
2
b) 2n
2
c) 2n
8.
In formula to find out number of electrons in an orbit "n" indicates.
a) Energy level
b) Energy level or orbit number
c) All are correct
d) Orbit number
9.
The formula 2n
2
works perfectly to work out electronic configuration of all elements.
a) True
b) False
10.
The number of sub shells present in a shell is equal to its_____?
a) 2n
2
b) Principle quantums number
c) Number of orbits
d) None is correct
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