CBSE Questions for Class 11 Medical Chemistry Environmental Chemistry Quiz 10 - MCQExams.com

What is an agent orange?
  • A biodegradable insecticide
  • A weedicide containing dioxin
  • Colour used in fluorescent lamp
  • A hazardous chemical used in luminous plants
Which disease in children is caused by intensive use of nitrate fertilizer?
  • Jaundice
  • Methemoglobinemia
  • Mumps
  • Septicemia
In insect ecdysone takes part in?
  • Growth and development
  • Maturation into adult
  • Moulting till pupa is formed
  • Secretion of cuticle
The correct match is:
  List - I  List - II
 A. TLV 1. Oxygen required to oxidise organic substance present in polluted water.
 B. COD 2. Oxygen used by microorganisms present in water for 5 days
 C. DO 3. $$O_2$$ present in water is in dissolved state.
 D. BOD 4. Permissible level of pollutant that can be present in a mine.

  5. $$O_2$$ that is present in atmosphere.
  • A-2, B-3, C-5, D-1
  • A-3, B-4, C-2, D-5
  • A-4, B-1, C-3, D-2
  • A-1, B-2, C-4, D-3
The production of dihydrogen gas via water gas shift reaction,
 
$$CO(g) + H_2O (g) \xrightarrow {\Delta/Catalyst} CO_2(g) + H_2(g).$$

The $$CO_2$$ gas is removed by scrubbing with solution of:
  • sodium arsenite
  • calcium oxide
  • sodium phosphate
  • aluminium oxide
Positive pollution of soil is due to
  • Reduction in soil productivity
  • Addition of waste to soil
  • Excessive use of fertilizers
  • All of the above
Which one of the following is an environment related disorder with the correct main cause? 
  • Black lung disease (pneumoconiosis) found mainly in workers in stone quarries and crushers.
  • Blue baby disease (methemoglobinemia) due to heavy use of nitrogenous fertilizers in the area.
  • Non-Hodgkin's lymphoma found mainly in workers involved in manufacture of neem based pesticides.
  • Skin cancer can be observed mainly in people exposed to benzene and methane.
The common refrigerant chlorofluoro-methane (freon) and NO$$_2$$ is a serious pollutant because 
  • It lowers atmospheric temperature.
  • It prevents cloud condensation.
  • It destroys haemoglobin.
  • It disrupts O$$_3$$ layer.
The molecular action of ultra violet light is mainly reflected through
  • Photodynamic action
  • Destruction of hydrogen bonds between DNA strands
  • Formation of pyridine
  • Destruction of ester bonds
It has been estimated that is all the $$O_3$$ in the atmosphere were brought to sea level at $$STP$$, the gas would form a layer $$0.3\space cm$$ thick. Estimate the number of $$O_3$$ molecules in the earth's atmosphere.
(radius of the earth is 4000 mile, 1 km = 0.6214 mile)
  • $$2.48\times10^{37}$$ ozone molecules
  • $$4\times10^{37}$$ ozone molecules
  • $$4.2\times10^{37}$$ ozone molecules
  • $$4\times10^{35}$$ ozone molecules
An important product in the ozone depletion by chlorofluorocabons is
  • $$ Cl_2$$
  • $$ OCl $$
  • $$ F_2 $$
  • $$ O_2F_2 $$
The 'blue baby' syndrome is related to 
  • Excess of TDS (total dissolved solid)
  • Excess of chloride
  • Methemoglobin
  • Excess of dissolved oxygen
State True or False.
Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules.
  • True
  • False
It has been estimated that is all the $$O_3$$ in the atmosphere were brought to sea level at $$STP$$, the gas would form a layer 0.3 cm thick. Estimate the number of $$O_3$$ molecules in the earth's atmosphere. (radius of the earth = 4000 mile; 1 km = 0.6214 mile).
  • $$3.9 \times 10^{37}$$
  • $$4.2\times 10^{37}$$
  • $$4.5\times 10^{37}$$
  • $$6.79\times 10^{37}$$
Most insecticides attack upon insects on their
  • Digestive system
  • Reproductive system
  • Nervous system
  • Respiratory system
Chlorofluorocarbons are not recommended to be used in refrigerators, because they
  • Increase temperature
  • Depletes ozone
  • Affects environment
  • Affects human body
Which among the following are the consequences of ozone depletion?
  • Entry of UV-rays in earth's atmosphere
  • Various skin troubles like skin cancer
  • Cataract
  • All of the above
The gas that causes the depletion of the ozone layer thereby allowing more UV radiations to reach the Earth is
  • Carbon dioxide 
  • Chlorofluorocarbon 
  • Oxygen 
  • Nitrous oxide 
Carbamates are used as a
  • Insecticide
  • Herbicides
  • Fungicides
  • All of the above
Which one of the following is responsible for causing skin cancer and mutation? 
  • Ozone depletion
  • Smog formation
  • Snowfall
  • Smoke from aeroplane
Which of the following is a microbial pesticide?
  • Rotenone
  • Thurioside
  • Baygon
  • Temik
Natural insecticide obtained from
  • Azadiracta indica
  • Derris elliptica
  • Chrysanthemum cinerari folium
  • All of the above
Which one of the following is the chief ozone-depleting substance used in refrigerators and air conditioners as coolant?
  • Chlorofluorocarbons (CFCs)
  • Carbon tetrachloride
  • Methyl chloroform
  • Methyl bromide
Ozone hole enhances
  • UV radiations reaching earth
  • Number of cataracts
  • Skin cancers
  • All of the above
The main problem caused by the use of pesticides is
  • Their residues persist in water and other components of the environment.
  • Mosquitoes have become resistant to DDT.
  • They kill silk worm.
  • They deform the gills of some fishes.
Ozone protects biosphere from high energy
  • Infra-red rays
  • Ultraviolet rays
  • X - rays
  • Gamma rays
Which one of the following is an environment related disorder with correct main cause?
  • Black lung disease is found mainly in workers of stone quarries and crushers.
  • Blue-baby disease is due to heavy use of nitrogeneous fertilizers.
  • Non-Hodgkin's lymphoma is found mainly in worker involved in manufacture of neem-based pesticides.
  • Skin cancer occurs mainly in people exposed to benzene and methane.
Chlorofluorocarbon releases a chemical harmful to ozone
  • Fluorine
  • Sulphur dioxide
  • Nitrogen peroxide
  • Chlorine
Eutrophication means __________.
  • excessive richness of nutrients in a water body or lake due to run off
  • decrease in growth of algae
  • increase in fertility of soil
  • all the above
In the environment, ozone is known for its 
  • Harmful effects
  • Useful effects
  • Both A and B
  • Inert nature
CFCs used in refrigerators cause 
  • Water pollution
  • Ozone depletion
  • Acid rain
  • Photochemical smog
The major drawback of DDT as a pesticide is that
  • It is significantly less effective than other pesticides.
  • Its cost of production is high.
  • It is not readily and rapidly degraded in nature.
  • Organisms at once develop resistance to it.
The major drawbacks of DDT as a pesticide is that:-
  • Organisms at once develop resistance to it
  • It is significantly less effective than other pesticides
  • Its cost of production is high
  • It is not readily and rapidly degraded in nature
The pair of chemicals that maintain heat balance in troposphere are:
  • $$CO_2, O_2$$
  • $$N_2, O_2$$
  • $$O^{\oplus}, O_3$$
  • $$H_2O, NO^{\oplus}$$
$$CFCl_3$$ is responsible for the decomposition of ozone. Which of the following reacts with ozone to form oxygen?
  • $$\overset{\bullet}{Cl}$$
  • $$Cl^-$$
  • $$Cl_2$$
  • $$F^-$$
Ozone depletion is occuring widely in the stratosphere, it leads to ozone hole caused mainly due to
  • Ethylene
  • Methane
  • CFCs
  • $$CO_{2}$$
Snow blindness is caused due to
  • Ozone hole
  • Nuclear winter
  • Acid rain
  • Green house effect
The consumption of pesticides used to kill pests can cause ______________ in some cases.
  • Cancer
  • Death
  • Paralysis
  • All of the above
When soil pH is in the range 6 to 8, the soil fertility is diminished.
  • True
  • False
Which is a common impurity in 2, 4, 5-T:
  • TCDD
  • 2, 4 - D
  • Ethylene
  • Terpenes
Green chemistry deals with:
  • study of plant physiology
  • study of extraction of natural products from plants
  • detailed study of reactions involved in the synthesis of chlorophyll
  • utilization of existing knowledge base for reducing the chemical hazards along with developmental activities
  • synthesis of chemical compounds using green light
Ozone depletion shall cause higher incidence of
  • Skin cancers
  • Cataract
  • Decreased immunity
  • All of the above
Ozone hole over Antarctica was first detected by
  • Molina and Rowland
  • Farman et al
  • Augus
  • Molina and Molina
Which of the following is a measurement of water pollution?
  • PSC
  • PCB
  • BOD
  • COD
Match the Lists I and II and pick the correct matching from the codes given below.
                List I              List II
(i) Peroxy acetyl nitrateCarcinogens
(ii) Polycyclic aromatic hydrocarbonsGlobal warming
(iii) IR active moleculesPhotochemical smog
(iv) DioxinsWaste incineration
  • (i) - 3, (ii) - 1, (iii) - 4, (iv) - 2
  • (i) - 3, (ii) - 2, (iii) - 4, (iv) - 1
  • (i) - 3, (ii) - 1, (iii) - 2, (iv) - 4
  • (i) - 4, (ii) - 2, (iii) - 1, (iv) - 3
Match the Column I and Column II and choose the correct code given below.
Column IColumn II
(A) Peroxyacetyl nitrile(i) Waste incineration
(B) Indigo(ii) Vat dye
(C) IR active molecules(iii) Global warming
(D) Dioxins(iv) Photochemical smog

  • A-(iv); B-(ii); C-(iii); D-(i)
  • A-(i); B-(ii); C-(iv); D-(iii)
  • A-(ii); B-(i); C-(iv); D-(iii)
  • A-(iv); B-(i); C-(iii); D-(ii)
Which of the following is/are correct statement(s) regarding increasing population as a reason for water scarcity?
  • Increasing population creates demand for construction of houses, shops, offices, roads and pavements.
  • This decreases the open areas like parks, and playgrounds.
  • This in turn decreases the seepage of rainwater into ground.
  • A pukka floor does not allow water to seep in easily, while in a grass lawn water seeps through in no time.
The gas emitted by supersonic jet planes that slowly depletes the concentration of the ozone layer is:
  • $$CO$$
  • $$NO$$
  • $$S{ O }_{ 2 }$$
  • $${ O }_{ 2 }$$
  • $$HF$$
Part of ozone is destroyed over poles during
  • Polar spring
  • Winter
  • Summer
  • Period of snow fall
Ultraviolet radiations from sunlight cause a reaction which produces
  • $$O_3$$
  • $$SO_2$$
  • CO
  • $$CH_4$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers