`0.5g` sample of iron containg mineral mainly in the form of `CuFeS_(2)` was reduced suitably to vonvert all the ferruic ions into ferrous ions `(Fe^(3+) rarr Fe^(2+))` and was obtained as solution. In the absence of any interferring radical, the solution. In the absence of any interfeerring radical, the solution required `42mL` of interferring radical, the solution required `42mL` of `0.1M K_(2)Cr_(2)O_(7)` for tirtration. Calculate `%` of `CuFeS_(2)` in sample.

Answer

`92.48%`