Question # 1

Which is the most toxic among the given?

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heavy metals

non-metals

Metals

Metalloids

The words smog is a combination of smoke and:

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fog

foke

fork

fizzy

Ozone is a gas having boiling point

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Unstable

High

Low

Moderate

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will not cause water pollution

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live stock waste

agricultural pesticides

oil beaks and spills

all of the above

CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC

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CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

The main pollution of leather tanneries in the waste is due to the salt of

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Chromium

Copper

Chromium

Lead

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

The 95.5% mass of Lithoshone is made of 11 elements i,e O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. Which element is present in trace amount

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iodine

bromine

lead

carbon

The bonding occurs among polar covalent molecules containing H and one of the small electronegative element such as O,F or N is called:

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Ionic bonding

Metallic bonding

Bridge bonding

H-bonding

As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:

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10 isomers

3 isomers

5 isomers

6 isomers

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

Proxy acetyl nitrate (PAN) is an irritant to human beings and it affect

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Nose

Stomach

Eyes

Ears

Which factor is helping to reduce the environment pollution

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rapid growth population

urbanization

idustrialization

increase of plantation

Which one of the following does not act as pollutant

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Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

The overall effect of the photochemical smog in the after noon is built up of

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Neutralization

oxidizing agent

Reducing agent

Activating agent

Water is purified by:

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Filtration

aeration

coagualation

All of these

Newspapers can be recycled again and again by how many times

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5

2

4

3

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

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10,000

20,000

100,000

50,000

Atmosphere consists of gasses:

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N₂

O₂

Ar

All

What change in plants indicates toxic effect of SO₂

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Weathering of leaves

Darkening of leaves

Falling of leaves

Bleaching of leaves

Exposure to CO results in

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Headche

Fatigue

Unconsciousness

All of these

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

The normal amount of overhead ozone is about in DU:

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150

250

350

450

Incineration is a process in which solid waste is burned at high temperature ranging from

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500 to 600°C

900 to 1000°C

1000 to 1100°C

600 to 700°C

Chlorofluorocarbon, CF₂Cl₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Hardness which can be removed by boiling is called

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Permanent hardness

Temporary hardness

Stiffness

Toughness

A single free chlorine redical can destroy ozone molecules upto:

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100000

100

1000

10000

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

Water is purified by the process:

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Aeration

Coagulation

Chlorination

All of these

HOCl is a compound:

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Polor inorganic

organic

Ionic

covalant

How much pesticides have been synthesized at present?

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Four thousand

Six thousand

Eight thousand

Ten thousand

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Potable water is considered to be

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Safe for human consumption

The ground water

The surface water

Now safe for human consumption

By the mid of 1980s depletion of total overhead ozone in antarctic region is

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20%

30%

40%

50%

Water which forms scum with soap is called

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Hard water

Soft water

Distilled water

Un distilled water

The Catalyst used in the contact tower for the manufacture of H₂SO₄ is easily poisoned by:

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Nitrous oxide

Nitrogen gas

Arsenic oxide

Carbon dioxide

Which one is more toxic?

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Fe

C

Hg

Ag

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

Water exist in only

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One state

Two state

Three states

4 states

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium.

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sulphates

oxides

hydroxides

chlorides

One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

Coagulation removes suspended particles in ran water:

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60%

70%

80%

90%

Term ozone hole is used for depletion of ozone during months of:

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

Temporary hardness can be removed by adding

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Lime

Carbon

Oxygen

Slaked lime

Chloroform is carcinogenic:

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Heart

Lungs

Liver

Kidney

Electropositive character increases down the groups due to:

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Increase in atomic size of the elements

Decrease in ionization potential

Decreases in electromagnetically of the element

All the above

The branch of chemistry interlinked with biology, physics, medicines, agriculture, public health and sanitary engineering etc. is:

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Biochemistry

Physical chemistry

Pharmaceutical chemistry

Environmental chemistry

Which is used as a coagulant:

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Ferric salts

Potash alum

a and b both

Chlorine

Boron, aluminium, gallium, indium and thallium belong to group lll-A of the periodic table show a decrease with increasing relative atomic mass:

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Ionic character of the compounds

The first ionization energy

The basic character of the oxides

The stability of +2 oxidation

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

The destructive distillation of coal gives three products. which of following is not the product of destructive distillation of coal?

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Coal tar

CO₂

Coal gas

Coke

Chemical equilibrium involving reactants and products in more than one phase is called:

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Homogeneous

Heterogeneous

Dynamic

Static

Ecosystem is a smaller unity of

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Nydosphere

Biosphere

Lithosphere

Attmosphere