(a) Following is the alignment of magnetic moments of a substance when placed in a magnetic field. Identify the type of magnetism exhibited by the substance.

(b) Analysis shows that nickel oxide has formula Ni_{0.98}O_{1.00}. What frctions of nickel exist as Ni^{2+} and Ni^{3+} ions?

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) Since all the magnetic moments are directed in the same direction, the substance exhibit ferromagntism.

(b) Ratio of Ni and O in Nickel oxide is,

\frac{Ni}{O}= \frac{0.98}{1.00}=\frac{98}{100}

Total nickel atoms for 100 atoms of oxygen is 98.

Let x be the number of nickel with +2 charge.

\therefore Nickel with +3 charge = 98 - x

charge of nickel = charge on oxygen

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

     2 x +294-3x= 200

    -x = 200 - 294= -94

    x = 94

\therefore Nickel with +2 charge = \frac{94}{98}=96%

\therefore Nickel with +3 charge = 98-94=4 out of 98 =\frac{4}{98}=4%

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