Question # 1

Fish die in water bodies polluted by sewage due to.

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Pathogens

Clogging of gills by silt

Reduction in dissolved oxygen

Foul smell

Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives.

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o - creaol

p - creaol

2,4 -dihydroxy toluene

Benzoic acid

Which of the following is not a characteristic of covalent compound.

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They have low melting and boiling points.

They ionize on dissolution in polar solvents

Their molecules have definite geometry

They are generally insoluble in water

Which of the following species is very good oxidizing agent.

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MnO₄

H+

Zn²⁺

Fe³⁺

How many sigma and pi bonds are there in a CO2 molecule.

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2 sigma

2 sigma and 4 pi

2 sigma and 2 pi

4 sigma and no pi

Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called.

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Glass wool

Safety glass

Optical glass

Jena glass

DDT is

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Biodegradable pollutant

Nodegradable contaminant

Air pollutant

An antibiotic

The rate at which a substance reacts depends on its.

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Molecular mass

Active mass

Equivalent mass

Molar mass

An element having low IE and low EA is likely to belong to.

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Group IA

Group IB

Group VII A

Group VIII

The light source in AAS used is

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UV light

Visible light

Radio waved

Hollow cathode lamp

Human hearing is sensitive to frequency in the range of about

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10,000 - 20,000 Hz

10 - 10,000 Hz

16- 20,000 Hz

None of the above

Example of peseudohalonge group.

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Cyanogen

Thiocyanogen

Selenocyanogen

All above

The statement that heat cannot flow spontaneously from a colder to a hotter body is the result of.

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The first law of thermodynamics

The second law of thermodynamics

The third law of thermodynamics

Henry's law

Nitrobenzen can be prepared from benzene by using a mixture of conc. HNO3 and conc. H2SO4 In the nitrating mixture. HNO3 acts as a.

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Base

Acid

Oxidizing agent

Catalyst

The width of a typical DNA molecule is _______nm

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1

2

5

10

Which of the ionic possesses highest bond energy.

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C-C

Si -Si

Ge - Ge

Sn -Sn

C is -2 butene on reaction with bromino give 2,3 -dibromobutane which is

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

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

The bond along Sp2 hybridization is.

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180^o

120^o

109.5^o

160^o

Which of the following metal acts as pollutant.

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Hg

Pb

Zn

Ni

All above

Among the following statements in the nitration of aromatic compounds, the false one is.

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The rate of nitration of benzene is almost the same as that of hexadeutero benzene

The rate of nitration of toluene is greater than that of benzene

The rate of nitrationof benzen is greater than that of hexadeutero benzene.

Nitration in an electrophite substitution reaction.

The thermal conductivity of an SWNT along length is _____ watt/(m.k)

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35

330

386

3500

Relative order of acidity of oxy acid

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HCIO > HCIO2 > HCIO3 > HCIO4

HCIO4 > HCIO3 >HCIO2 > HCIO

HCIO3 > HCIO2 > HCIO > HCIO4

HCIO2 > HCIO4 > HCIO3 > HCIO

Artificial nitrogen fixation may occur by the formation of.

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Nitric acid

Ammonia

Nitrides

Any of above

Identify a dye which was ot originally obtained from plant source.

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Alizarin

Tyrian purple

Indigotin

Quercitrin

In extraction of iron, the furnace charge consists of iron ore, coke and limestone. The function of limestone is to act as.

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An oxidation agent

A reducing agent

Flux

Slag

Ozone layer of upper atmosphere is being destroyed by

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chlorofluorocarbons

SO2

Photochemical oxidants O2 and CO2

Smog

All bond length in benzene are identical due to.

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Resonance effect

Inductomeric effect

Electromeric effect

Mesomeric effect

Inter halogens are of types.

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3

4

5

6

Among LiCl, BeCl2, BCl3, and CCl4 the covalent bond character follows the order.

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LiCl < Becl2< Bcl3 < CCl4

LiCl > BeCl2 < BCl3<CCl4

LiCl< Becl2 < BCl3 < CCl4

LiCl > Becl2 > BCl3 < CCl4

A terpenoid which as an alcoholic group in the molecule is

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Citral

Camphor

Menthol

Carvone

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