Question # 1

Which of the following statement is related with CO.

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It is a colorless and tasteless gas

It has less affinity to words hemoglobin

It has a boiling point of -192 ^oC

It is a dangerous asphyxiant

Which of the following techniques is used for cleanup of samples prior to introduction into chromatographic column.

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Paper chromatography

TLC

Solvnent extraction

Solid phase extraction

Both C and D

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

Phosphorus has the oxidation state of +3 in

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Orthophosphoric acid

Hypophosphoric acid

Metaphosphoric acid

Orthophosphorus acid

Give violet colour to flame

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Gallium

indium

Thallium

Aluminium

The expected specific waste fo petroleum industry is.

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Asphalt and tars

Paper

Cloth

Fibre

What is the ASTM tension testing designation for standard method for steel products.

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A 370

E 345

E8

E 9

Which are not considered member of d-block elements.

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Zn

Cd

Hg

All above

The elements with highest electron affinity belongs to.

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Period 2 , group 17

Period 3, group 17

Period 2, group 18

Period, 2 , group 1

The instrument used for measuring fluorescence is known as.

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Fluorimeter

Potentiometer

Flame photometer

Mass spectrometer

The first ionization energy of Mg is lower than

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Na

Ca

Al

Be

Which of the following statements is not related with flame photometric analysis.

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Vaporization of the solvent leaving back the residue

Conversion of solid slat to the gaseous state

Dissociation of gaseous molecules into free atoms

Measurement of the intensity of absorbed tradition

The gases that are responsible for green house effect are.

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CO2 & CH4

CFC

N2O

All above

When metal orbital are rotated in octahedral field the following representation obtained.

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t2 g + lg

a1 g

t 1 u

All above

Heisenberg's uncertainty principle precludes the exact simultaneous measurement of.

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Velocity and energy

Velocity and time

Charge density and probability

Position and momentum

The diameter of a bucky ball is about _____________

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o

1 A

1 nm

o

100 A

10 nm

The orientation of a crystalline surface is confidently defined in terms of.

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Lijima Indices

Miller indices

Clausen indices

None

The total number of bond pairs around sulphur and total number of lone pairs around oxygen atoms in the Lewis structure of sulphate ion are respectively.

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4, 12

8,12

12,4

6 ,12

Ziegler -Natta catalysta is

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(C2H3)3 Al

TiCl4

(C2H5)3 Al/TiCl4

(C2H3)3 B/TiCl2

The law which relates the solubility of a gas to its pressure is called.

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Raoult's law

Nernst law

Ostwald's law

Hennery's law

All steroids on heating wish solenium give

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phenanthrene

Cholesterol

Diels hydrocarbon

Isoprene

Setting of cement is improved by

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Lime stone

Clay

Gypsum

Water

Which type of the solids are generally good conductors of electricty.

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Covalent

Ionic

Metallic

Molecular

The solution of NaOH pH -10.46 contain [OH-]

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2.0 X. 10^-4

4.6 X 10^-4

4.6 X 10^-2

4.6 X 10^-3

An stereospecific enzyme in one which catalyses

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Formation of one stercolsomer

Reaction of one stereoisomer only

Both of these

None of these

What % if nickel is present in the major ore Pentlandite.

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22%

18%

14%

10%

In terms of the amount of the substance adsorbed per gram of the adsorbent (x/m), and pressure p of the gas, the Freudlich adsorption isotherm is represented as.

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x/m = k/pⁿ

x/m = kpⁿ

p = k (x/m)ⁿ

x/m = (k/p)ⁿ

If the activation energy in the forwarded direction of an elementary step is 52 kj and the activation energy in the reverse direction is 74 kj. What is the energy of reaction Delta E for this step

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22 Kj

-22 kj

52 kj

-52 kj

Which of the following methods gives the number average molecular weight of a polymer.

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Light scattering method

Osmotic method

Sedimentation equilibrium method

Viscosity method

What element constitutes the major component of most bronzes.

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Tin

Zinc

Carbon

Aluminum

The speed of a chemical reaction

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Is constant no matter what the temperature is.

Is independent of the amount of contact surface of a solid involved

Between gases should is all cases be extremely repid because the average kinetic energy of the molecules is great

Between ions in aqueous solution is extremely rapid because there are no bonds that need to be broken

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