AP EAMCET202022 Sep 2020Morning ShiftChemistrySolid StateActual
Analysis shows that nickel oxide has the formula Ni _ 0.98 O _ 1.00 . The fractions Ni ²⁺ and Ni ³⁺ ions in the crystal are ......
Options
- ANi ²⁺=98 % and Ni ³⁺=2 %
- BNi ²⁺=2 % and Ni ³⁺=98 %
- CNi ²⁺=4 % and Ni ³⁺=96 %
- DNi ²⁺=96 % and Ni ³⁺=4 %
Correct answer
D. Ni ²⁺=96 % and Ni ³⁺=4 %
Step-by-step solution
It is given that, nickel oxide has the formula as Ni _ 0.98 O _ 1.00 . As per the formula, there are 98 Ni ions for 100 oxide ions. Out of 98 Ni ions, let x ions be in +2 oxidation state. (98-x) ions will be in +3 oxidation state. Oxide ion has -2 charge. To maintain electrical neutrality, total positive charge on cations = total negative charge on anions. aligned 2 x+3(98-x)+100(-2) & =0 x & =94 aligned Fraction of Ni ²⁺ ions = 94 98 =0.96 Fraction of Ni ³⁺ ions = 4 98 =0.04 Hence, the fractions of nickel that exi