Question # 1

The force which hold the atoms together to form a compound is called:

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Dispersion forces

London forces

A chemical bond

Ven der wall's forces

The morality of the solution containing x grams ammonium sulfate in 500cm3 of the solution is 0.6 what is x?

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39.6

40.5

42.7

45.1

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

How can heavy metal contamination like the presence of Hg or Pb may be removed from the soil

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by using water spray

by blowing air

by treating with EDTA and then flushing the heavy metal complex out of the soil

by adding CaO

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

Rigid rocky crust earth upto a depth of 100 km is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Polycyclic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

Commonly used coagulants are ions of:

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Ferrous

Al

Cr

Ferric

Which one of the following is not a component of environment

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Biosphere

Stratosphere

Hydrosphere

Lithosphere

A large hole in the ozone layer over antarctica region was discovered in:

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1960s

1970s

1980s

1990s

Unit of ozone is?

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Debye

Dobson

Esu

Coulumb

The range of UV-B is:

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320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

The cause of minamata disease is the pollution of

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Arsenic (As) into atomosphere

Industrial waste having Hg

Organic waste in drinking H₂O

Oil spills in H₂O

Chemical like Al₂(SO₄) or alum are used in purification of water druing step:

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aeration

coagulation

chlorination

treatment

Ozone is produced in regions:

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tropical

Polor

antaric

equator

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

0.1M HCI having pH =1.0 it is about 100 time stronger than acetic acid what will be the pH of acetic acid:

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0.1

1.3

2

3

Hard water can block radiators due to formation of

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Insoluble calcium and magnesium salts

Insoluble sodium salts

In soluble phosphate salts

Insoluble potassium salts

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

Why is carbon monoxide called as pollutant? The reason is that

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It combines with oxygen

It combines with haemoglobin

It inactivates glycolysis

It inactivates nerves

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Three elements needed for the healthy growth of plants are

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N P K

N K C

N S P

N Ca P

Coal contains percentage of sulphur:

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1-9%

5-9%

6-9%

7-9%

During incineration temperature range of non-rotating chamber is

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900-1000C°

650-1100C°

950-1300C°

700-900C°

In addition to many pollutants present in ground water, a successful study was conducted to remove a highly Toxic chemical.What chemical is this

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Cobalt

Nickel

Arsenic

Sulphur

Water is considered pollutant when value of Do is

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6 PPM

8 PPM

03 PPM

10 PPM

Agriculture consumes part of fresh water:

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1%

2%

69%

23%

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Water in swimming pools is purified by adding

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Sodium

Chlorine

Phosphorus

Potassium

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

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

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

Ecology is a science of environment and deals specially with

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stratosphere

biosphere

lithosphere

hydrosphere

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

In the atmosphere, O₂is about

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10%

15%

21%

25%

The ozone depletion in the stratophere is mainly due to the reaction of ozone with

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Freons

CFCs

Both A and B

None

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

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Chromium

Copper

Chromium

Lead

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg Toxic.

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

Which of the following does not contribute towards the formation of photochemical smog?

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NO

SO₂

O₃

Hydrocarbons

Natural water is

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Pure

Impure

Acts as solute

Distilled

Detergent greatly effects the

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Aquatic life

Modern life

Terrestrial life

Plants life

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

Biochemical oxygen demand is the capacity of organic matter in natural water to consume oxygen

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2 days

5 days

6 days

7 days

Soil remediation means

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to make it suitable for cultivation of crops

to make it acidic

to make it alkeline

to add manure into it

The yellow color present in the photo chemical smog is due to presence of the

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Carbon dioxide

Nitrogen dioxide

Chlorine

All

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

White marble buildings are effected by?

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O₂

SO₂

CI₂

CFC_s

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

A pollutant affects

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Human affects

Quality of life

Functioning of ecosystem

All of these

Chlorination of water is effective for

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Killing pathogens

Removing dust

Removing hardness

Increasing oxygen content

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

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

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%