Which one of the following is a good conductor of electricity?
Diamond
Graphite
Silicon
Amorphous carbon
Doping of silicon with boron leads to
n-type semiconductor
p-type semiconductor
superconductor
insulator
The electronic configuration of an element C is 1s2, 2s2, 2p6. The formula of substance containing only C will be
C8
C4
C2
C
Number of carbon atoms in kerosene is
C17-20
C12-16
C20-25
C25-30
B.
C12-16
Kerosene is a thin, clear liquid formed from hydro carbons obtained from the fractional distillation of petroleum between 150-275°C resulting in a mixture with a density of 0.78-0.81 g/cm3 composed of carbon chains that typically contain between 6 and 16 carbon atoms per molecule.
C14 is
a natural non-radioactive isotope
an artificial non-radioactive isotope
an artificial radioactive isotope
a natural radioactive isotope