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Q.

Fe(SCN)n3−n absorb color because of the complex Fe(SCN)n3−n only, whereas Fe3+ and SCN- both are colorless. In the given table, the equilibrium concentration of Fe3+and SCN- and corresponding absorbance are given.  Considering absorbance proportional to concentration of the complex, the value of n is

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a

3

b

6

c

4

d

2

answer is A.

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Detailed Solution

Fe3++nSCN−⇄Fe(SCN)n3−nKform=[ Complex ]Fe3+SCN−n∵ [ complex ]=Kform Fe3+SCN−n∴ log⁡[ complex ]=log⁡Kform +log⁡Fe3++nlog⁡[SCN]Fe3+ is constant, hence, log⁡[ Complex ]1[ Complex ]2=nlog⁡SCN−1SCN−2∴ log⁡3/0.3=nlog⁡10(10)2/3⇒1=n×13 or n=3
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