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0.5g sample of iron containg mineral mai...

`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.

Text Solution

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The correct Answer is:
`92.48%`
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A 0.5 g sample of an iron containing mineral mainly in the form of CuFeS_2 was reduced suitable to convert all the ferric ions into the ferrous form and was obtained as a solution. In the absence of any interfering matter, the solution required 42 " mL of " 0.1 M K_2Cr_2O_7 solution for titration calculate the percentage of CuFeS_2 in the mineral (Cu=63.5,Fe=55.8)

0.2828g of iron wire was dissolved in excess dilute H_(2)SO_(4) and the solution was made up to 100 mL . 20mL of this solution required 30mL of N//30 K_(2)Cr_(2)O_(7) doluyion for exact oxidation. Calculate % purity of Fe in wire.

Knowledge Check

  • Interfering radicals interfere the test of

    A
    Group III radicals only
    B
    Group III radicals or downward
    C
    Cation which are present in group II fitrate
    D
    None of these

  • Volume of 0.1M K_(2)Cr_(2)O_(7) required to oxidise 35 mL of 0.5M FeSO_(4) solution is

    A
    `29.2 mL`
    B
    `17.5mL`
    C
    `175 mL`
    D
    `145 mL`

  • Which of the following anion(s) is/are interfering radicate ?

    A
    `BO_(3)^(3-)`
    B
    `F^(Θ)`
    C
    `PO_(4)^(3-)`
    D
    None of these

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    0.2828 g of iron wire was dissolved in excess dilute H_(2)SO_(4) and the solution was made upto 100mL. 20mL of this solution required 30mL of N/(30)K_(2)Cr_(2)O_(7) solution for exact oxidation. Calculate percent purity of Fe in wire.

    3.0 g of pyrolusite ore were treated with 20 g of pure ferrous ammonium sulphate (Mol.mass =392 " g mol"^(-1)) and dilute H_(2)SO_(4) . After the reaction, the solution was diluted to 500 mL. 50 mL of diluted solution required 10 mL of 0.1 N K_(2)Cr_(2)O_(7) solution. Calculate the % of pure MnO_(2) in pyrolusite.

    Volume of 0.1 M K_(2)Cr_(2)O_(7) required to oxidise 35 mL of 0.5 M FeSO_(4) solution is :

    Volume of 0.1 M K_(2)Cr_(2)O_(7) required to oxidize 35 mL of 0.5 M FeSO_(4) solution is

    Volume of 0.1 M K_(2)Cr_(2)O_(7) required to oxidise 35 mL of 0.5 M Fe SO_(4) solution is

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