Which one of the following is a good conductor of electricity?
Diamond
Graphite
Silicon
Amorphous carbon
Which one of the following is maximum electronegative?
lead
Silicon
Carbon
Tin
C.
Carbon
In a group, electronegativity decreases from top to bottom due to increases in atomic size. Hence, carbon is maximum electronegative.
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
C14 is
a natural non-radioactive isotope
an artificial non-radioactive isotope
an artificial radioactive isotope
a natural radioactive isotope