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Formula of nickel oxide with metal deficiency defect in its crystal is Ni0.98O. The crystal contains Ni2+ and Ni3+ ions. The fraction of nickel existing as Ni2+ ions in the crystal is

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answer is 2.

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Detailed Solution

Ni0.98O=Ni2+xNi3+0.98-xO2-1 Net charge = 0 [x×2]+[(0.98-x)×3]+[-2×1]=0 x = 0.94 Fraction of nickel existing as Ni2+=0.940.98=0.959≈0.96

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