A lone pair of electrons in an atom implies
a pair of valence electrons not involved in bonding
a pair of electrons involved in bonding
a pair of electrons
a pair of valence electrons
C14 is
a natural non-radioactive isotope
an artificial non-radioactive isotope
an artificial radioactive isotope
a natural radioactive isotope
D.
a natural radioactive isotope
Carbon has three important isotopes C12, C13 and C14. C14 is formed is traces in the atmosphere by cosmic bombardment of nitrogen.
7N14 + 0n1 → 6C14 + 1H1
C14 is a natural radioactive isotope.
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
Bio gas production is more useful when compared to the direct use of dung because
both fuel value and fertiliser value are effectively utilised
production of bio gas involves less labour
fuel is quickly produced
the fertiliser produced is a fluid