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

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

Question : 16

Total: 50

Analysis shows that nickel oxide has the formula Ni0‌.98O‌1.00. What fractions of nickel exist as Ni‌2+ and Ni‌3+ ions?

Solution:

98 Ni-atoms are associated with 100 O-atoms. Out of 98 Ni-atoms,
suppose Ni present as Ni‌2+ = x
Then Ni present as Ni‌3+= 98–x
Total charge on x Ni‌2+ and (98 – x) Ni‌3+ should be equal to charge on 100 O‌2– ions.
Hence, x×2+(98−x)×3=100×2
or 2x+294−3x=200 or x=94
∴‌‌ Fraction of ‌Ni present as Ni2+=

×100=96%
Fraction of Ni present as Ni3+=

×100=4%

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

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