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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