Answer:
(i)
Ge doped with In. When Ge (group 14) is doped with In (group 13), out of the
four valence electrons of Ge, three are shared with three electrons of In. This
will result in holes in the crystal lattice of germanium and the crystals are \[p\]-type
semiconductors.
(ii) B doped with Si. When B (group 13)
is doped with Si (group 14), only three of the valence electrons of silicon
will be shared by the three valence electrons of boron. The presence of extra
or free electrons not involved in bonding will result in \[n\]-type
semiconductors.
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