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The amount of oxygen used by the suitabl...

The amount of oxygen used by the suitable microorganisms present in water during five days at `20^(@)C` is called as BOD. For pure water BOD is about 1 ppm fairly pure water 3 ppm and doubtful purity 5 ppm the municipal sewage has BOD values 100-4000 ppm.
BOD= Number of moles of `O_2` required / Number of liters of water sample
BOD is normally cxpressed for a time period of

A

5 hours

B

5 minutes

C

5 days

D

5 seconds

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • The amount of oxygen used by the suitable microorganisms present in water during five days at 20^(@)C is called as BOD. For pure water BOD is about 1 ppm fairly pure water 3 ppm and doubtful purity 5 ppm the municipal sewage has BOD values 100-4000 ppm. BOD= Number of moles of O_2 required / Number of liters of water sample The BOD value of municipal sewage is

    A
    1 ppm
    B
    5 ppm
    C
    5-10 ppm
    D
    100-4000 ppm

  • The amount of oxygen used by the suitable microorganisms present in water during five days at 20^(@)C is called as BOD. For pure water BOD is about 1 ppm fairly pure water 3 ppm and doubtful purity 5 ppm the municipal sewage has BOD values 100-4000 ppm. BOD= Number of moles of O_2 required / Number of liters of water sample If water is polluted its BOD value is

    A
    1 ppm
    B
    2 ppm
    C
    3 ppm
    D
    6 ppm

  • The amount of oxygen used by the suitable microorganisms present in water during five days at 20^(@)C is called as BOD. For pure water BOD is about 1 ppm fairly pure water 3 ppm and doubtful purity 5 ppm the municipal sewage has BOD values 100-4000 ppm. BOD= Number of moles of O_2 required / Number of liters of water sample The BOD values of three water sample x,y and z are 5 mg/litre, 16 mg/Litre and 400 mg/Litre respectively the more polluted sample of water is

    A
    x
    B
    y
    C
    z
    D
    all are equally polluted

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    Municipal sewage BOD values (ppm) are_

    Pure water would have a BOD value of

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