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Answer: Ni exists in +2 and +3
Explanation:
x(0.98)+1(-2)=0
0.98x-2=0
0.98x. =2
X = 2/0.98
X = 200/98
X. = 2.04. Avg oxidation state
Ni3+ fraction =2.04 -2/1 = 0.04
Ni3+ %=4
Ni2+ =100-4= 96%
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