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Analysis shows that nickel oxide has the formula Ni_0.98 O_1.00. What fraction of the nickel exist as Ni⁺² and Ni⁺³ ions ?

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Ni⁺² = 96%, Ni⁺³ = 4%

Ni⁺² = 50%, Ni⁺³ = 50%

Ni⁺² = 25%, Ni⁺³ = 75%

Ni⁺² = 10%, Ni⁺³ = 90%

answer is A.

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Detailed Solution

Ni⁺² = x, Ni⁺³ = y
x+y=98
2x+3y=200
$\begin{array}{l} % of x = \frac{94}{98} \times 100 = 96 % \\ % of y = 100 - 96 = 4 % \end{array}$

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