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0.5 gmixture of K(2)Cr(2)O(7) and KMnO(4...

0.5 gmixture of `K_(2)Cr_(2)O_(7)` and `KMnO_(4)` was treated with excess of KI in acidic medium. Iodine liberated required `150 cm^(3)` of 0.10 N solution of thiosulphate solution for titration.
Find trhe percentage of `K_(2)Cr_(2)O_(7)` in the mixture :

A

14.64

B

34.2

C

65.69

D

50

Text Solution

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The correct Answer is:
A
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0.5 g mixture of K_(2)Cr_(2)O_(7) and KMnO_(4) was treated with excess of KI in acidic medium. Iodine liberated required 100 cm^(3) of 0.15N sodium thiosulphate solution for titration. Find the per cent amount of each in the mixture.

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A mixture contaning 0.05 moleof K_(2)Cr_(2)O_(7) and 0.02 "mole of" KMnO_(4) was treated eoith excess of KI in acidic medium. The liberated iodine required 1.0L "of" Na_(2)S_(2)O_(3) solution for titration. Concentration of Na_(2)S_(2)O_(3) solution was:

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0.80 g of sample of impure potassium dichromate was dissolved in water and made up to 500 mL solution. 25 mL of this solution treated with excess of KI in acidic medium and I_(2) liberated required 24 mL of a sodium thiosulphate solution. 30 mL of this sodium thiosulphate solution required 15 mL of N//20 solution of pure potassium dichromate. What was the percentage of K_(2)Cr_(2)O_(7) in given sample?

Knowledge Check

  • 0.5 g mixture of K_(2)Cr_(2)O_(7) and KMnO_(4) was treated with excess of KI in acidic medium. Iodine liberated required 100 cm^(3) of 0.15 M sodium thiosulphate solution for titration. The percent amount of KMnO_(4) in the mixture is (Atomic weight – K = 39, Cr = 52, Mn=55, Na=23, S=32)

    A
    `85.36%`
    B
    `82.34%`
    C
    `54.22%`
    D
    `34.56%`

  • A mixture contaning 0.05 moleof K_(2)Cr_(2)O_(7) and 0.02 "mole of" KMnO_(4) was treated eoith excess of KI in acidic medium. The liberated iodine required 1.0L "of" Na_(2)S_(2)O_(3) solution for titration. Concentration of Na_(2)S_(2)O_(3) solution was:

    A
    `0.4 molL^(-1)`
    B
    `0.20 molL^(-1)`
    C
    `0.25 molL^(-1)`
    D
    `0.30 molL^(-1)`

  • The n-factor for K_(2)Cr_(2)O_(7) in acidic medium is

    A
    `+2`
    B
    `+4`
    C
    `+6`
    D
    `+8`