Class 9 Chemistry MCQ
The number of electrons in K shell of O is ________________
9
10
2
1
In a discharge tube, the pressure of a gas is kept at
10-2 atm
10-4 atm
10-6 atm
10-8 atm
Electron ________________ energy when they jump from low to higher level.
Absorb
Radiate
Nothing
Nil
L shell can accommodate ________________ electrons.
2
8
18
32
The maximum no.of electrons that can be accommodated in M shell are
2
8
18
32
Cathode rays are actually
Electrons
Protons
Neutrons
Photons
The p subshell has:
one orbital
two orbitals
three orbitals
four orbitals
Half life of C-14 ________________ years.
5800
5700
5600
5500
The value of Planck’s constant is
6.63 x 10-34 Js
6.63 x 10-32 Js
6.63 x 10-30 Js
6.63 x 10-28 Js
The lowest energy level is
K
L
M
N
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