Question # 1

Which of the following statements is not related to the decomposition phenomenon occurring in nature.

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Decomposition is due to autotrophic organisms

Decomposition involves bacteria and fungi

During decomposition organisms carry out specific reactions

Many species of decomposer are present in the biosphere

At the some temperature 0.1 M solution of urea is isotonic with.

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0.1 M glucose solution

0.1 M NaCl solution

0.1 M urea solution

0.1 M BaCl2 solution

The first ionization energy in electron volts of nitrogen and oxygen atoms are respectively given by.

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14.6, 13.6

13.6, 14.6

13.6, 13.6

14.6, 14.6

In which polymerization branching of chain cannot be possible.

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Free radical

Cationic

Anionic

Anionic and Zieglar Natta

Rectified spirit obtained by formentation contains 5% of water .So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated Benzene helps because.

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It is dehydreating agent and so removes water

It forms the loweer layer which retains all the water so that alcohol can be distilled off

It form an azeotropic mixture having high boiling point and thus allows the alcohol to distall over

It forms low boiling azeotropic mixture which distille over leaving behind pure alcohol which can than be distilled.

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

Which one of the following does not exhibit paramegnetion.

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NO

NO2

CiO2

CIO-2

The stationary and mobile phases in paper chromatography are.

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^{Liquid/Liquid}

Solid /Liquid

Liquid/Solid

Gas/solid

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

Which of the following statement is not correct with respect to radioactive pollutnats.

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Carcinoma and breast cancer

Leukemia

Increases biological immune system

Somatic and generic disorder

The maximum noise level at which a man can work for 8 hours is.

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80 dB

70 dB

90 dB

60 dB

Which of the following is not an alkali metal.

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Potassium

Francium

Sodium

Strontium

In Dannis's method the end of the copper caps into which graphite electrode are fixed with cement.

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Portiant

Bakelite

Asbestos

All of above

NH4OH in the presence of H2S is used as a group reagent for which of the following group.

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Group I

Group II

Group III

Group IV

_{Which of the following salt is soluble in water.}

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BaCO3

SrCO3

CaCO3

K2CO3

Which of the following organic molecule is not aromatic.

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Benzene

Naphthalene

Anthracene

Cyclo-octatetraene

Which of the following methods is chemical in nature.

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Acid bas titration

Redox titration

Complexometric titration

All above methods

Co enzyme cna be separated from enzyme by

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Precipitation

Dalysis

Hydrolysis

Distillation

Which of the following molecules belongs to C_av point group.

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H2O

H2S

NH3

BF3

The pKa of acetic acid is 4.74 which implies that.

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pH of 1N solution is 4.74

At pH 4.74 the dissociation of acetic acid is maximum

At pH 4.74 half of the acetic acid molecules are dissociated in the solution.

At pH 4.74 the dissociation of acetic acid is minimum.

What is the advantage of quench hardening?

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Imporoved strength

Hardness

Wear characteristics

All of the choice

Temporary hardness of water is due to.

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Bicarbonates of K

Bicarbonates of Na

Carbonates of Ca

Bicarbonates of Ca

The mole of photon is knonw as.

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Quantum

Einstein

Energy packet

None of the above

The pH of the tears is

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7.0

7.4

7.8

8.2

In hydrogen bonding a hydrogen atom is bonded to which of the highly electronegative atoms.

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N

O

F

N,O,F

Which of the following is an azo dye.

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Congo red

Rhodamine B

Ertythroein

Paraosaniline

Increased asthmatic attacks in certain seasons are related to.

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Inhalation of seasonal pollens

Eating of seasonal vegetables

Low temperature

Wet and dry environment

In the metallurgy of iron, when limestone is added to the blast furnaced, the calcium ion ends up in

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Slag

Gangue

Metallic calcium

Calcium carbonate

The diameter of a bucky ball is about _____________

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o

1 A

1 nm

o

100 A

10 nm

Which of the following is NOT true 7 ceramic materials are.

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Hard, have high densities high compressive strength and very good thermal resistance and strength at higher temperature Silicon

Hard, have low densities high compressive strength and very good thermal resistance and strength at higher temperature.

Hard, have low densities low compressive strength and very good thermal resistance and strength at higher temperature.

Hard, have low densities' high compressive strength and very good thermal resistance and strength at higher temperature.

Which are not considered member of d-block elements.

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Zn

Cd

Hg

All above

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