Question # 1

Acid rain has pH less than.

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6

7

7.4

5.6

Which branch of chemistry deals with the study of stars, planets, comets and interstellar space.

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Physical chemistry

Medcinal chemistry

Astrochemistry

Geochemistry

A compound with chemicla formula Na₂CX₃ has formula mass 106 ami. Atomicmass of the elemetn X is.

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16

23

12

106

Which one is not an Arrhenius base.

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KOH

NaOH

NH3

Ca(OH)2

Mark the icorrect statement about ionization energy.

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It is measured in kJmol-1

It is absorption of energy

It decreased in a period

It decrese in a group

All the noble gases have their valence electrons.

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Incomplete

Partialy filled

Completely filled

None of the above

Which area of chemistry imoroves to gauge the behavior of pollutants and develp techniques for polution control?

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analytical chemistry

geochemistry

Organic chemistry

Environmental Chemsitry

According to Arrhenius concept base is a substance which dissociates in aqueios solution to give

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Hydroxide ions

Hydrogen ions

Pair of Electrons

Proton

Which branch of chemistry helps to protectwater that bas been poisoned by soil.

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Organic chemistry

inorganic chemistry

Environmenal chemistry

Geochemistry

Whcih of the following is not true about the formationof Na₂S

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Each sodium atom loses one electron

Sodium forms cation

Each sulphur atom gains one electron

Sulphur form anion

How many covalent bonds does C₂H₂ molecule have.

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Two

Three

Four

Five

A base is a substance which neutralizes an acid which of these substances is not a base?

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Aqueous ammonia

Sodium chloride

Sodium Hydroxide

Calcium Hydroxide

A reaction between an acid and base produce.

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Salt and water

Salt and gas

Salt and acid

Salt and bases

Ethylene is present is natural gas sometimes to the extent of .

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10%

20%

30%

40%

Which help to keep the bowel functioning property

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Dietary fiber

Vitamins

Lipids

Carbohydrates

What one of the following does not contain protein?

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Pulses

Potatoes

Beans

Eggs

Traces of acetylene are present to coal gas about.

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0.06 %

0.08%

1.1 %

90%

How many % age of nitrogen present in air by volume?

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70%

75%

78%

80%

The pH of acid rain.

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2

3

4

5

Which one of the following is gas at room temperature:

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C2H6

C6H14

C6H6

C8H18

The process of removal of gangue form the ore is technically known as:

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concentration

purification process

metallurgy

refining

Formula of Urea is.

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KCNO

H₂N-CO-NH₂

HN-CO₂-NH

H₃N-CO-NH₃

The order of the rate of diffusion of gases NH3, SO3, Cl2 and CO2 is.

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NH3>SO2>CL2>CO2

NH3>CO2>SI2>Cl2

Cl2>SO2>CO2>NH3

The rate of reaction determined at any given time is called.

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Average rate

Instantaneous rate

Spontaneous rate

Over all rate

In which of the following changes, nitrogen in reduced.

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NH3 to NO

NH3 to NO3

N2 to NH3

N-3 to N2

If we plot a graph between I/V at x-axis and pressure at Y -axis

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a parabolic graph is obtained

By increasing temperature straight line move toward x axis

By increases temperature straight line move toward y axis.

No. change in line by increasing temperature.

The pH of 10^-3mol dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

Relative lowering of vapour pressure is equl to.

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Mole fraction of solute

Mole fraction of solvent

Molarity

Molality

Which one of the following salts do not hydrolyses

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CuSO4

Na2CO3

NaCl

AlCl3

Which one of the following is not property of a good solvent.

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It should be inexpensive

It should dissolve impurities easily

It should dissolve large amount of solute at boiling point and less amount of solute at low temperature.

It should not react chemically with solute

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0 ^oC

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546 ^oC

200 ^oC

546 K

273 K

Which one of the following enthalpies is always an exothermic process.

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Enthalpy of atomization

Enthalpy of neutralization

Enthalpy of ionization

Enthalpy of dissociation

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

Which of the following is not a fatty acid

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Propanoic acid

Acetic acid

Phthalic acid

Butanoic acid

Saturated hydrocarbon are also called.

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Olefins

Acetylenes

Paraffins

Alicyclic

Disinfection of water by chlorine is done by the production of.

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NH2Cl

NCl2

HOCl

NHCl2

Thickness of atmosphere is about how much kilometer above the surface of warth

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100 km

1000 km

10,000 km

unlimited

Acetaldehyde undergoes, aldol condensation in the presence of.

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dil HNO3

DIL NaOH

dil HCl

Conc. H2SO4

Formula of choloroform is

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CH₃Cl

CCl₄

CH₂Cl₂

CHCI₃

Ammonium nitrate fertilizers is not used for which crop

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Cotton

Wheat

Sugar cane

Paddy rice

Acetylene polymerized in the presence of ammonium chloride and cuprous chloride ot form.

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Benzene

PVC

Di vieiyl acetylene

Polyethene

Wohler synthesized first organic compound in laboratory from

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Heating cyanogen's

Cyanogen and ammonium chloride solution

Cyanogen and HNO2

Heating ammonium cyanate

Acid rain fist of all was observed by

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Augus Smith

Robert Hook

Mosley

Watson

Which one of the followings is woody raw material used for making pulp and paper

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Eucalyptus

Wheat straw

Bagasse

Cotton linter