Question # 1

Ground water is threatened with pollution from which of the following source.

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Domestic wastes

Industrial wastes

Agricultural wastes

All above

Ozone is stratosphere is depleted by

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CF2Cl2

C7F16

C6H6Cl6

C6F6

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

Which of the following is class of nanorods

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metals

alloys

Metal oxide and Metal sulphite

All of the above

Which of the following does not apply to metallic bond.

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Overlapping valence orbitals

Mobile valency electron

Delocalized electrons

Highly directed bonds

Which of the following reactions have small enthalpy change.

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NaOH with HCl

NaOH with CH3 COOH

HCl with NH4 OH

None of these

What is abuckyball

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A carbon molecule

Nickname for Mercedes -Benz's futuristic concept car (CIII)

Plastic explosives nanoparticle (C4)

Concrete nanoparticle with a compressive strength of 20 nanonewtons(C20)

The process of transfer of genetic message from DNA to m-RNA is known as

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Refplication

Translation

Transcription

Transference

The most important problem regarding nano chemistry

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Elucidation of relationship between also and chemical reactivity of particle

Determination of size of particle

Determination of reactivity of particle

Determination of physical properties of nano particles.

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

Anything that influence the valence electrons will affect the chemistry of the element Which of the following factors does not affect the valency shell.

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Valence principle quantum number in

Nuclear charge (Z)

Nuclear mass

Number of core electrons

A system which can exchange energy as well as natter with its surrounding is said to be a/an

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Closed system

Inert system

Open system

All of above

VBT is unable to explain the nature of some of the complexes of.

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Cobalt

Copper

Nickle

Manganese

Which one of the following set of raw material is most suitable for manufacture of urea.

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CH4N2 and CO2

H2CO2 and H2O

H2O N2 and H2

H2O N2 AND KCl

An example of acyclic polytropenoid is

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Myrcone

Buna -S

Synthetic rubber

Natural rubber

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

A closed system is one which can exchange with surrounding.

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Matter but not energy

Energy but not matter

Both matter and energy

Neither matter nor energy

Valence bond theory is also called as

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Electron pair theory

Band theory

Electron gas theory

Electron pool theory

Nitric acid has the property

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Nitrating

Reducing

Redoxing

None of above

In the Lewis structure of H2SO4 molecule the total number of unshared electrons in valence shell of various atoms is.

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8

16

12

20

Organic farming is the technique of raising crops through uses of.

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Manures

Biofertilizers

Resistant varieties

All of these

The most suitable method of separation in mixture of o-and p- nitrophenol is.

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Steam distillation

Chromatography

Ion-exchange

Sublimation

Which of the following substance is not weak electrolyte.

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CH3COOH

NH4OH

Oxalic Acid

NaCl

CoCl3 ,6NH3 has six NH3 molecules that satisfy the valency of the Cu3+ metal ion

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Primary

Secondary

Both A and B

None of above

Which of the following is not an alum.

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KAI (SO4)3 12 H2O

NaAI (SO4)2 12 H2O

NH4Fe (SO4)2 12H2O

FeAl (SO4)2 . 12 H2O

The total number of crystal systems and the number of Bra via is lattices are.

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7,7

7,14

14,7

14,28

The bond angle between hybrid orbitals in methane is

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115.5^o

109.5^o

105,7^o

120^o

What element is the most abundant by mass in the Earth's crust.

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Fe

H

O

K

The specific gravity of H2SO4 is

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1.37

1.84

1.17

1.57

Which of the following detector is used for compounds containing electronegative atoms.

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Mass specdtrometer

ECD

TCD

UV-detector

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