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Acedified K2Cr2O7 cannot oxidise...

Acedified `K_2Cr_2O_7` cannot oxidise

A

Ferrous to ferric

B

Sulphide to sulphur

C

Stanous to stannic

D

Flouride to flourine

Text Solution

Verified by Experts

The correct Answer is:
D
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The COD value of a water sample is 40 ppm. Calculate the amount of acidified K_2Cr_2O_7 required to oxidise the organic matter present in 500 ml of that water sample.

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Knowledge Check

  • K_2Cr_2O_7 cannot be used for

    A
    preparing azo compounds
    B
    tanning leather
    C
    as a laboratory oxidant
    D
    as a reductant

  • Acidified K_2Cr_2O_7 changes to green on reactions with

    A
    `SO_2`
    B
    `FeSO_4`
    C
    Kl and then adding hypo
    D
    `NaCl + conc. H_2SO_4`

  • COD of a water sample is 8ppm the weight of acidified K_2Cr_2O_7 required to oxidise the organic matter present in one litre of water sample is

    A
    98 mg
    B
    49 mg
    C
    196 mg
    D
    98 g

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