Home
Class 11
CHEMISTRY
500 ml of a sample COD of water required...

500 ml of a sample `COD` of water required 19.6 mg of `K_(2)Cr_(2)O_(7)` of water sample is

A

8 ppm

B

6.4 ppm

C

16.8 ppm

D

4.9 ppm

Text Solution

Verified by Experts

The correct Answer is:
2
`19.6xx10^(-3) g K_(2)Cr_(2)O_(7) …… 500 ml` of `H_(2)O ?......... 10^(6) ml` of `H_(2)O`
`49g` of `K_(2)Cr_(2)O_(7)=8g` of `O_(2)`
`39.2 g` of `K_(2)Cr_(2)O_(7) =?`
`COD=6.4` ppm
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ENVIRONMENTAL CHEMISTRY

    NARAYNA|Exercise LEVEL -III|30 Videos

  • ENVIRONMENTAL CHEMISTRY

    NARAYNA|Exercise LEVEL-IV|27 Videos

  • ENVIRONMENTAL CHEMISTRY

    NARAYNA|Exercise LEVEL -I (C.W)|49 Videos

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY

    NARAYNA|Exercise EXERCISE - 4|17 Videos

  • F-BLOCK ELEMENTS

    NARAYNA|Exercise LEVEL-II (C.W)|1 Videos

Similar Questions

Explore conceptually related problems

20 mL of a solution containing ferrous sulphate and ferric sulphate acidified with H_(2)SO_(4) is reduced by metallic zinc. The solution required 27.4 mL of 0.1 N solution of K_(2)Cr_(2)O_(7) for oxidation. However before reduction with zinc, 20 mL of same solution required 17.96 mL of same K_(2)Cr_(2)O_(7) . Calculate the mass of FeSO_(4) " and " Fe_(2)(SO_(4))_(3) per litre of the solution.

Calculate the percentage of Cr in a sample of dichromate ore if 1.0 g of the sample after fusion is treated with 60 " mL of " 0.1 N FeSO_(4).(NH_(4))_(2)SO_(4) and the excess of Fe^(2+) requires 11.2 " mL of " K_(2)Cr_(2)O_(3) in the sample.

Knowledge Check

  • 500 ml of sample COD of water required 19.6 mg of K_(2)Cr_(2)O_(7) of water sample is

    A
    8 ppm
    B
    6.4 ppm
    C
    16.8 ppm
    D
    4.9 ppm

  • 500 mL of a sample of water required 19.6 mg of K_2Cr_2O_7 for the oxidation of dissolved organic matter in it in the presence of H_2SO_4 . The COD of water sample is

    A
    8 ppm
    B
    6.4 ppm
    C
    16.8 ppm
    D
    4.9 ppm

  • 100 mL of a sample of hard water requires 25.1 mL of 0.02 N H_(2)SO_(4) for complete reaction, The hardness of water ( density 1g//mL) is:

    A
    `200"ppm"`
    B
    `250"ppm"`
    C
    `251"ppm"`
    D
    `258"ppm"`

    • Similar Questions

    Explore conceptually related problems

    100 ml of a sample of water requires 1.96 mg of potassium dichromate in the presence of 50% H_(2)SO_(4) for the oxidation of dissolved oxygen demand.

    Potassium iodide reacts with acidified K_(2)Cr_(2)O_(7) . How many moles of KI are required for one mole of K_(2)Cr_(2)O_(7) ?

    A 2.18 g sample contains a mixture of XO and X_(2)O_(3) . It reacts with 0.015 moles of K_(2)Cr_(2)O_(7) to oxidize the sample completely to form XO_(4)^(-) " and " Cr^(3+) . If 0.0187 mole of XO_(4)^(-) is formed , what is the atomic mass of X ?

    10 mL of water requires 1.47 mg of K_(2) Cr_(2)O_(7) (M.wt. =294) fo oxidation of dissolved organic matter . C.O.D is

    10 mL of water requires 1.47 mg of K_2Cr_2O_7 (M. wt. = 294) for oxidation of dissolved organic matter COD is

    Home
    Profile