A) \[{{[Fe{{(O{{H}_{2}})}_{2}}(SCN)]}^{2+}}\]
B) \[{{[Fe{{(O{{H}_{2}})}_{5}}(SCN)]}^{2+}}\]
C) \[{{[Fe{{(O{{H}_{2}})}_{8}}(SCN)]}^{2+}}\]
D) \[{{[Fe(O{{H}_{2}})(SCN)]}^{6+}}\]
Correct Answer: B
Solution :
On adding \[SC{{N}^{-}}\] to an aqueous solution of \[Fe{{(N{{O}_{3}})}_{3}}\], a blood red colour, due to the formation of \[{{[Fe{{({{H}_{2}}O)}_{5}}(SCN)]}^{2+}}\] complex, is obtained. This test is used for the detection of \[F{{e}^{3+}}\]ion. \[SC{{N}^{-}}+Fe{{(N{{O}_{3}})}_{3}}+{{H}_{2}}O\xrightarrow{{}}\] \[\underset{blood\,\,\,red\,\,\,colour}{\mathop{[Fe{{(O{{H}_{2}})}_{5}}{{(SCN)}^{2+}}+NO_{3}^{-}}}\,\]
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