A) \[{{[Fe{{(OH)}_{5}}]}^{3-}}\]
B) \[{{[FeC{{l}_{6}}]}^{3-}}\]
C) \[{{[Fe{{(CN)}_{6}}]}^{3-}}\]
D) \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{3+}}\]
Correct Answer: C
Solution :
\[C={{C}_{0}}{{\left( \frac{1}{2} \right)}^{y}}\] \[y=\frac{total\text{ }time}{half\text{ }time}=3\] \[=100{{\left( \frac{1}{2} \right)}^{3}}\] \[=12.5g\]
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