Natural abundance of hydrogen with mass no.1 is?
(a) 99.9 %
(b) 98.9%
(c) 97.9 %
(d) 96.9%
Natural abundance of hydrogen with mass no.2 is?
(a) 0.012%
(b) 0.013%
(c) 0.014 %
(d) 0.015 %
How many isotopes are present in nature?
(a)260
(b) 270
(c) 280
(d) More than 280
There are _________ natural radioactive isotopes ?
(a) 30
(b) 40
(c) 50
(d) 60
There are ________________ artificial radioactive isotopes?
(a) 200
(b) 300
(c) 400
(d) 500
Mono-isotopic elements are?
(a) Arsenic
(b) Fluorine
(c) Iodine
(d) All of them
How many isotopes are there in element with odd atomic number?
(a) Two
(b) More than 2
(c) Less than 2
(d) Both a and b
Dempster’s mass spectrometer was designed for identificatio1of isotopes of elements in?
(a) Solid state
(b) Liquid state
(c) Gaseous state
(d) None of them
During mass spectrometry, vapors pressure is kept at
(a) 10^-6-10^-7 torr
(b) 10^-5-10^-6 torr
() 10^-4-10^-5 torr
(d)10^-3-10^-4 torr
Mass spectrum is plotted between relative abundance and__________?
(a) Mass number
(b) Atomic number
(c) Both a and b
(d) None of them
Atomic mass depends upon?
(a) Nb of isotopes
(b) Natural abundance
(c) Both a and b
(d) None of them
Average atomic mass of neon is?
(a) 20.18 amu
(b) 20.19 amu
(c) 20.20 amu
(d) 20.21 amu
Back to Main Menu (Current Affairs MCQs).