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Formula of nickel oxide with metal deficiency defect in its crystal is $Ni_{0.98}O$. The crystal contains $Ni^{2+}$ and $Ni^{3+}$ ions. The fraction of nickel existing as $Ni^{2+}$ ions in the crystal is
Detailed Solution
Let $Ni^{2+}=x$, so $Ni^{3+}=0.98-x$. Charge balance: $2x+3(0.98-x)=2 \Rightarrow x=0.94$. Fraction of $Ni^{2+}=\frac{0.94}{0.98}\approx0.96$.