The reaction between lead ion and chloride ion is given below: Pb2+(aq) + 2 Cl-(aq) PbCl2(s)
We therefore know that which of the following reactions can also occur?
a) Pb(s) + Cl2(g) PbCl2(s)
b) PbCl2(s) Pb(s) + Cl2(g)
c) CH4(g) CO(g) + 3 H2(g)
d) None of the Above

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

The answer to the question is d