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Given below are two statements:
Statement I: The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life.

Statement II: The optimum value of BOD is 6.5 ppm.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Important Questions on Environmental Chemistry

EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Water samples with BOD values of 4 ppm and 18 ppm, respectively, are:
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Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Biochemical Oxygen Demand BOD is the amount of oxygen required (in ppm ):
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Water filled in two glasses A and B gave BOD values of 10 and 20, respectively. The correct statement regarding them is
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
A water sample has ppm level concentration of the following metals:

Fe=0.2; Mn=5.0; Cu=3.0; Zn=5.0 .

The metal that makes the water sample unsuitable for drinking is
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
BOD is a measure of
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
The condition that indicates a polluted environment is:
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Which one of the following statements is NOT correct?
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of:
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
BOD stands for:
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Eutrophication causes
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Addition of phosphate fertilizers to water bodies causes:
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Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution

Which of the following statement(s) is (are)
incorrect reason for eutrophication?
(A) excess usage of fertilisers
(B) excess usage of detergents
(C) dense plant population in water bodies
(D) lack of nutrients in water bodies that prevent plant growth

Choose the most appropriate answer from the options given below :

MEDIUM
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Identify the correct statements from the following
I) Chemical Oxygen Demand (COD) of water is determined by oxidising organic substances with acidified K2Cr2O7
II) High concentration of CO2 leads to stiffness of flower buds
III) NO2 is a lung irritant
IV) Photochemical smog is also called reducing smog.
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Eutrophication causes
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Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively as:
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
Water sample is called cleanest on the basis of which one of the BOD values given below :
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
The maximum prescribed concentration of copper in drinking water is:
MEDIUM
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting 3Ca3PO42.CaOH2 to:
EASY
Chemistry>Inorganic Chemistry>Environmental Chemistry>Water Pollution
A water sample has ppm level concentration of following anions

F-=10; SO42-=100; NO3-=50

The anion/anions that make/makes the water sample unsuitable for drinking is/are