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Standard XII

Chemistry

BOD and COD

Assertion :Am...

Question

Assertion :Amount of organic biodegradable compounds present in water is measured by the BOD of that water. Reason: During bio degradation of biodegradable organic compounds, oxygen is released by bacteria.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
Organic biodegradable (i.e., they can be degraded by decomposers) pollutants in water are measured by BOD. BOD (biological oxygen demand) is the oxygen demanded or required by bacteria and other decomposers to oxidise pollutants.

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Similar questions

Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :Amount of organic biodegradable compounds present in water is measured by the BOD of that water. Reason: During bio degradation of biodegradable organic compounds, oxygen is released by bacteria.

The correct option is C Assertion is correct but Reason is incorrect.Organic biodegradable (i.e., they can be degraded by decomposers) pollutants in water are measured by BOD. BOD (biological oxygen demand) is the oxygen demanded or required by bacteria and other decomposers to oxidise pollutants.

The correct option is C Assertion is correct but Reason is incorrect.
Organic biodegradable (i.e., they can be degraded by decomposers) pollutants in water are measured by BOD. BOD (biological oxygen demand) is the oxygen demanded or required by bacteria and other decomposers to oxidise pollutants.