Question # 1

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

Volcanoes produce SO₂:

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47%

57%

67%

77%

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

Detergent greatly effects the

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Aquatic life

Modern life

Terrestrial life

Plants life

Why a C- C bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Which is the most toxic among the given?

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heavy metals

non-metals

Metals

Metalloids

Why a C - Cl bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

Uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Which of the following is a macronutrient?

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Boron

Iron

Copper

Carbon

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

A chemist says that glass must be a super cooled liquid. the reason that he might have in his mind is that glass has:

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Definite shape

Definite volume

Crystalline structure

No crystalline structure

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

Which not a method for solid waste management>

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Landfill

Incinerating

Recycling

None of these

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

Which is property of CO?

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Soluble in water

Insoluble in water

No toxic

Pole coloured

Temporary hardness can be removed by adding

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Lime

Carbon

Oxygen

Slaked lime

Nitrogen in the atmosphere is:

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78%

21%

0.9%

0.03%

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Which one is more toxic?

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Fe

C

Hg

Ag

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

The percentage of SO₂ produced by volcanoes is:

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47%

57%

67%

77%

Which gases are produced from landfills?

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NH₃

H₂S

N₂

All of these

Water is considered pollutant when value of Do is

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6 PPM

8 PPM

03 PPM

10 PPM

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

Fresh water of total earth water is:

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1%

2%

3%

4%

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

Ozone is an allotropic form of:

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Carbon

Phosphorus

Oxygen

Sulfur

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

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Biochemistry

Physically chemistry

Pharmaceutical chemistry

Environmental chemistry

Fungicides are the pesticides which:

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Control the growth of fungus

Kills insects

Kills plants

Kill herb

In Purification of potable water the coagulant used is

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nickel sulpahte

copper sulpahte

barium sulphate

alum

Pan is an irritant to human beings and it affects

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Eyes

Nose

Hair

Skin

Natural water is

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Pure

Impure

Acts as solute

Distilled

The rigid rocky part of earth crust called lithosphere extends upto a depth of:

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10 km

100 km

1000 km

1500 km

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Water is purified by:

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Filtration

aeration

coagualation

All of these

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

HOCl is a compound:

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Polor inorganic

organic

Ionic

covalant

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

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

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of

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2 day

6 day

5 day

7 day

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

Ecology is a science of environment and deals specially with

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stratosphere

biosphere

lithosphere

hydrosphere

A single free chlorine redical can destroy ozone molecules upto:

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100000

100

1000

10000

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

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

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

Phenomenon of acid rains gain importance in:

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1930s

1940s

1950s

1960s

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

a hole used to dump the municipal wastes is called:

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landfill

effluents

leachate

inclneration

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

The film forming components of paints are

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resins

thinners

pigments

driers

What is the effect of polluted air on environment

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Ozone

Acid rain

Global warming

Smog

Polycyclic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive