1 .
Atom was a name given by
A .
Democritus
B .
Bohr
C .
Rutherford
D .
Archimedes
2 .
The number of unstable isotopes is
A .
300
B .
50
C .
360
D .
370
3 .
The empirical formula of benzene is similar to
A .
water
B .
glycerine
C .
hydrogen peroxide
D .
glucose
4 .
Relative number of ions in mass spectrometer is plotted as
A .
none
B .
z axis
C .
abscissa
D .
ordinate
5 .
Isotopes present in nature are
A .
270
B .
280
C .
290
D .
300