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
C14 is
a natural non-radioactive isotope
an artificial non-radioactive isotope
an artificial radioactive isotope
a natural radioactive isotope
A cuprous ore among the following is
cuprite
malachite
chalcopyrites
azurite
A.
cuprite
Cuprous ore is cuprite, Cu2O.
Aluminium oxide is not reduced by chemical reactions since
reducing agent contaminate
the process pollute the environment
aluminium oxide is highly stable
aluminium oxide is reactive