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Chemistry - 9 Chapter - 3
Atomic Structure
Test - 12
1.
Electronic configuration of
14
6
C is
a) 2S
2
2p
2
3s
2
b) 1s
2
2s^2 2p
2
c) 1s
2
2s
2
2p
6
3s
2
3p
2
d) 1s
2
2s
2
3s
2
2.
Mass of an electron is ( ^ indicates raise to the power }
a) 1.673x10
-27
Kg
b) 1.76x10
-11
Kg
c) 1.602x10
-19
Kg
d) 9.109x10
-31
Kg
3.
Charge on a neutron is:
a) None is correct
b) 1.673x10
-19
C
c) 9.109x10
-19
C
d) 1.76x10
-11
C
4.
The maximum number of electrons in p-sub shell are:
a) 6
b) 2
c) 14
d) 8
5.
Positive particles can carry minimum mass as that of
a) A hydrogen ion
b) A nitrogen ion
c) A carbon nucleus
d) A helium nucleus
6.
Mass number is the sum of
a) No. of neutrons and no. of protons
b) No. of electrons and no. of protons
c) No. of neutrons
d) No. of protons and no. of neutrons
7.
Atomic number of Silicon is:
a) 12
b) 13
c) 11
d) 14
8.
When molecules of nitrogen gas are bombarded with alpha particles:
a) Alpha particles are obtained
b) Electrons are obtained
c) Protons are obtained
d) neutrons are obtained
9.
Electronic configuration of calcium is
a) 2,2,4
b) 2,8,1
c) 2,8,8,2
d) 2,8,18
10.
In equation mvr=nh, n represents
a) The orbit occupied by an electron
b) Number of electrons
c) Total number of electrons in an atom
d) Number of valence shell
11.
Mosely found that positive charge on nucleus is due to the presence of:
a) b- particles in nucleus
b) Electrons in nucleus
c) Protons in nucleus
d) Neutrons in nucleus
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