Question # 1

Beside the common silica based SPE particles, polymer supports are also available They have advantages over silica based SPE particles, Which of the following reason is possible.

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These are stable over a wide pH range.

These do not possesses residual silica groups

These are designed to be wettable and have high capacity than silica base particles.

All above

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

What refer by the ability of steel to be hardened through to its centre in large section?

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Malleability

Hardenability

Ductility

Rigidity

The unit of sound pressure level is

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Pascal

Decibel

Newton

Ampere

Which of the following type of polymerization is used for the preparation of synthetic rubber.

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Free radical

Zingler natta

Cationic

Anionic

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware. etc. When mixed with cold con. H2SO4

The particle motion in solids is

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Only vibratory

Only translator

Vibratory and rotatory

Only translatory

Alums are generally used

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In Dying and water proofing of fabric

In arrest bleeding

IN water purification

All above

Identify the incorrect statement regarding crystallization from the following.

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It is an important procedure for purifying solids

The impurities are removed by filtering the solution

Crystals are separated by filtration

In crystallization method, the solid is dissolved in a solvvent in which it is soluble at all temperature.

What is the most common alloying ingredient in copper?

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Brass

Zinc

Cobalt

Nickle

According to SHAH concept the Lewis bases were classified on the basis os.

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Charge ion size

Polarization consideration

Electron and co coordinating ability

All of above

A mixture of ethyl iodide and n-propyl iodide is subjected to Wurts reaction. The hydrocarbon that will nto be formed is

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n-butane

n-propane

n-pentane

n-hexane

The substance that can form the glassy non-crystalline structure is called.

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Stabilizers

Fluxes or modifiers

Formers

None of these

The separation efficiency of a column can be expressed in terms of number of.

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Solvents used

Theoretical plates

Stationary phases

Mobile phases

Which of the following responsible for depletion of ozone layer in upper strata of the atmosphere.

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Polyhalogens

Ferrocene

Freons

Fullerencs

The correct order of second ionization potential of carbon , nitrogen, oxygen and fluorine is.

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C > N > O > F

O > N > F > C

O > F > N > C

F > O > N > C

A device which is used to measure the interracial angle is known as

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Voltmeter

Potentiometer

pH Meter

Goniometer

The SI unit of pressure is Pascal it is define da sa force per unit are of 1N/m2 one atmosphere of pressure is equal to.

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760 mm of Hg

1 bar

101 k Pa

760 torr

All are correct

Compounds HCN and HNC are.

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Tautomers

Metamers

Functional isomers

Conformers

In which of the following characteristics does hydrogen resemble halogens.

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Hydrogen is the lightest gas

H atoms contains one electron each

Hydrogen forms ionic hydrides with alkali metals

Hydrogen has three isotopes.

They hydrolysis of methly acetate is a reaction of.

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First order

Second order

Third oirder

Fourth order

The width of a carbon nano tube is.________ nm

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1

1.3

2.5

10

The fertilizers which provide single nutrient from NPK are called _______ fertilizer

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Straight

compound

Both A and b

None of above

Which of the following technique describes titrations in which a standard iodine solution is need.

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Iodometry

Iodimetry

potentiometry

Argentometry

An element with atomic number 20 is placed in which period of the periodic table.

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1

2

3

4

The bond length is measured by

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X-ray diffraction

Neutron diffraction

Microwave spectroscopy

All of above

Which of the following is not a component of hollow cathode lamp.

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Anode

Cathode

Filter gas

Atomic vapour

Pick out incorrect statement about K2Cr2O7

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It oxidizes acidified solution H2SO4 to S

It oxidizes KI to I2

It oxidizes HCl to Cl2

It gives oxygen, when treated with cold conc. H2SO4

The equivalent conductance (^) and molar conductance ( ^ m ) of BaSO4 are related as.

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^ = ^m/2

^/2 = ^m

^ = ^m

^ = ^m/4

The unit of sodium chloride structure is.

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Linear

Cubic

Tetrahedral

Square planner

The shape of SO₄^2-ion is.

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Tetrahedral

Trigonal planar

Square planar

Octahedral

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