Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Solid State – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium
When NiO is heated with a small amount of $\mathrm{Li}_{2} \mathrm{O}$ in air at $1200^{\circ} \mathrm{C}$, a non - stoichiometric compound $\mathrm{Li}_{\mathrm{x}} \mathrm{Ni}_{(1 \mathrm{x})} \mathrm{O}$ is formed. This compound is
(a)an n - type semiconductor containing only $\mathrm{Ni}^{+}$
(b)an n -type semiconductor containing $\mathrm{Ni}^{+}$ and $\mathrm{Ni}^{2+}$
(c)a p - type semiconductor containing $\mathrm{Ni}^{2+}$ and $\mathrm{Ni}^{3+}$
(d)a p - type semiconductor containing only $\mathrm{Ni}^{3+}$