Environmental Chemistry

Which one of the following gases is reported to retard photosynthesis?

Water sample is called cleanest on the basis of which one of the BOD values given below :

The statements that are TRUE :(A) Methane leads to both global warming and photochemical smog(B) Methane is generated from paddy fields(C) Methane is a stronger global warming gas than CO2(D) Methane is a part of reducing smogChoose the mos...

Given below are two statements :Statement I : Non-biodegradable wastes are generated by the thermal power plants.Statement II : Bio-degradable detergents leads to eutrophication.In the light of the above statements, choose the most appropri...

Reducing smog is a mixture of :

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...

The type of pollution that gets increased during the day time and in the presence of O3 is :

The green house gas/es is (are) :(A) Carbon dioxide(B) Oxygen(C) Water vapour(D) MethaneChoose the most appropriate answer from the options given below :

Biochemical Oxygen Demand (BOD) is the
amount of oxygen required (in ppm) :

Among the gases (a) – (e), the gases that cause greenhouse effect are :
(a) CO2
(b) H2O
(c) CFCs
(d) O2
(e) O3

The presence of soluble fluoride ion upto
1 ppm concentration in drinking water, is :

The condition that indicates a polluted environment
is :

The processes of calcination and roasting in
metallurgical industries, respectively, can Iead
to :

Thermal power plants can lead to :

The incorrect statement(s) among (a) – (d)
regarding acid rain is (are) :
(a) It can corrode water pipes.
(b) It can damage structures made up of stone.
(c) It cannot cause respiratory ailments in animals.
(d) It is not harmful for trees

The statement that is not true about ozone is :

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 :

Which of the following conditions in drinking water causes methemoglobinemia?

Excessive release of CO2 into the atomosphere
results in :

The layer of atmosphere between 10 km to
50 km above the sea level is called as :

Assertion : Ozone is destroyed by CFCs in the upper stratosphere.
Reason : Ozone holes increase the amount of UV radiation the earth.

Which is wrong with respect to our responsiblity as a human being to protect our environment?

The maximum prescribed concentration of
copper in drinking water is :

The molecule that has minimum /no role in the formation of photochemical smog, is :

Water samples with BOD values of 4 ppm and 18 ppm, respectively are :

The compound that is NOT a common component of photochemical smog is :

The correct set of species responsible for the photochemical smog is :

The primary pollutant that leads to photochemical smog is :

Peroxyacetyl nitrate (PAN), an eye irritant is produced by :

The concentration of dissolved oxygen (DO) in cold water can go upto :

The higher concentration of which gas in air can cause stiffness of flower buds?

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :

Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is :

The reaction that is NOT involved in the ozone layer depletion mechanism in the stratosphere is :

The regions of the atmosphere, where clouds form and where we live, respectively, are :

Air pollution that occurs in sunlight is :

Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?

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 [3Ca3 (PO4)2.Ca(OH)2] to

Which of the following is a set of greenhouse gases?

Identify the pollutant gases largely responsible for the discoloured and
lustreless nature of marble of the Taj Mahal.

A water sample has ppm level concentration of following anions
F- = 10; \(SO_4^{2-}\) = 100; \(NO_3^-\) = 50
The anion/anions that make/makes the water sample unsuitable for drinking is/are :

BOD stands for :

Which one of the following substances used in dry cleaning is a better strategy to control environmental 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 :

Identify the wrong statements in the following :

The smog is essentially caused by the presence of :