Class 9 Chemistry MCQ
Which of the following can accommodate 18 electrons?
K
L
M
N
Who discovered the proton?
Goldstein
J.J Thomson
Neil Bohr
Rutherxa0 Ford
The boiling point of H2O is:
100
12
1.105
9
The number of isotopes of carbon are
1
2
3
5
___________ is used in treatment of cancer.
Cobalt-60
C-12
H-3
Nil
First energy level is denoted by:
K
L
M
N
Which one of the following is the most penetrating?
protons
electrons
neutrons
alpha paticles
Which one of the following shell consists of three subshells?
K- shell
M-Shell
L-shell
M-shell
The isotopes C-12 is present in abundance of:
96.6%
97.6%
99.7%
None of these
“Atoms” means _________
Divisible
Indivisible
Break
Nil
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