Question

Analysis show that nickel oxide consists of nickel ion with 96% ions having $d^{8}$ configuration and 4% having of $d^{7}$ configuration. Which amongst the following best represents the formula of the oxide.

• A. $Ni_{1.02}O_{1.00}$
• B. $Ni_{0.96}O_{1.00}$
• C. $Ni_{0.98}O_{0.98}$
• D. $Ni_{0.98}O_{1.00}$

Answer 1

Answer: (D)

$d^{8} \rightarrow Ni^{+ 2}, \, d^{7} \rightarrow Ni^{+ 3}$

Total charge of nickel

$\left(0.96 \times 2\right)+\left(0.04 \times 3\right)=2.04$

Number of $O^{- 2}$ ion $=\frac{2.04}{2}=1.02$

Formula of solid $=NiO_{1.02}=Ni_{0.98}O_{1.00}$