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In the compound Ni₀.₉₈O, where the formula can be expressed as (Ni²⁺)x(Ni³⁺)₀.₉₈₋x(O²⁻)₁ and the overall charge is neutral, determine the proportion of nickel ions that are present as Ni²⁺.

1. 0.94
2. 0.96
3. 0.98
4. 0.99

Correct answer: 0.96

Solution

The total charge neutrality condition is used: x(Ni²⁺) + (0.98 - x)(Ni³⁺) = 2(O²⁻). Solving for x gives the fraction of Ni²⁺ as 0.96.

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