Assertion :The amount of BOD in the waters is a measure of the amount of organic material in the water. Reason: Clear water has BOD less than 5 ppm whereas highly polluted water have BOD value of 17 ppm or more.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
BOD is the amount of dissolved oxygen in water. It is needed by micro-organisms to oxidize inorganic and organic compounds. This is the correct explanation for assertion.

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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 (A) o-nitrophenol is less soluble in water than the m- and p-isomers.
Reason (R) m and p-nitrophenols exist as associated molecules.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. For the following Assertion and Reason, the correct option is:
Assertion: The

p H

of water increases with increase in temperature.

Reason: The dissociation of water into

H^{+}

and

O H^{-}

an exothermic reaction.

Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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.

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Assertion :The amount of BOD in the waters is a measure of the amount of organic material in the water. Reason: Clear water has BOD less than 5 ppm whereas highly polluted water have BOD value of 17 ppm or more.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionBOD is the amount of dissolved oxygen in water. It is needed by micro-organisms to oxidize inorganic and organic compounds. This is the correct explanation for assertion.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
BOD is the amount of dissolved oxygen in water. It is needed by micro-organisms to oxidize inorganic and organic compounds. This is the correct explanation for assertion.