Analysis shows that nickel oxide has the ...

NCERT Class XII Chemistry
Chapter - The Solid State
Questions with Solutions

Question : 16 of 50

Marks: +1, -0

Analysis shows that nickel oxide has the formula Ni0

_{.98}

_{1.00}

. What fractions of nickel exist as Ni

^{2+}

and Ni

^{3+}

ions?

Solution:

98 Ni-atoms are associated with 100 O-atoms. Out of 98 Ni-atoms,

suppose Ni present as Ni

^{2+}

x

Then Ni present as Ni

^{3+ }

98 - x

Total charge on x Ni

^{2+}

and (98 – x) Ni

^{3+}

should be equal to charge on 100 O

^{2-}

ions.

Hence,

x \times 2 + (98 - x) \times 3 = 100 \times 2

2x + 294 - 3x = 200

x = 94

\therefore\;\;

Fraction of

{\mathrm{Ni}}

present as

{\mathrm{Ni}}^{2+} = \frac{94}{98} \times 100 = 96\%

Fraction of Ni present as

{\mathrm{Ni}}^{3+} = \frac{4}{98} \times 100 = 4\%

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