Question # 1

If steel is heated to a temperature well below red heated and is then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

Which of the following combination is used to make buffer.

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NaOH and HCl

KOH and H2SO4

CH3COOH and CH3COONa

CH3COOH and NH4OH

CFT can very well explain

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Color

Magnetic properties

Spectra of transition metal

All

In proper rotation (Cn) an object is rotated through an angle of.

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a/n radians

2n/n radians

3n/n radians

4n/n radians

For a compound to act as a dye it must have

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A suitable colour

Ability to fix to fibre

Both A and B

None of these

SO2 is generated from which of the following industry.

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Drying and packing

Paper

Pulp

paper and pulp

The smallest cluster of carbon atoms in Bucky balls known till today consists of ___________ carbon atoms.

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75

20

60

15

Potassium sulphate with 48% to 52% potash, is made from.

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Potassium phosphate

Potassium Chloride

Potassium Nitrate

None of these

Mostly used solvents for ionic compounds.

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Liquid ammonia

Liquid SO2

Liquid HF

All above

Which of the following pollutant is not secondary pollutnat.

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SO3

NO2

SO2

Ozone

Concentration polarization arises because of the

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Different concentrations of solutions in the two half cells

Changes in the concentration of electrolyte around the electrode from bulk concentration

Reversible nature of the cell

Variation in temperature during measurements

Hydrolysis of nucleoprotein result in the formation of.

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Proteins

Nucleic acids

Both A and B

They do not hydrolyse

Which of the following device is used to measure the surface tension.

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Polarimeter

Viscometer

Refractometer

Stalagnameter

It is known that AgCl is insoluble in HNO3 but dissolves readily in NH4OH solution .Which of the following statement is not correct.

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Ag ion reacts to form complex with NH4OH solution

The concentration of Ag ion decreases

Ionic product is less than the solubility product

Ionic product is greater than solubility product

Polyamide jinkage is present in

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Nylon

Silk

Protein

All of these

Arrange the hydrides group 15 in the order of increasing boiling point.

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PH3 < AsH3 <SbH3 < BiH3 <NH3

PH3 <AsH3< SbH3< NH3 < BiH3

PH3 < AsH3<NH3 <SbH3<BiH3

NH3 < PH3 < AsH3 < Sb H3 < BiH3

Any property whose magnitude is independent of the amount of substance present is called a/an

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Extensive property

Colligative property

Structural propety

Intensive property

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

Purpose of sizing is.

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To increase the strength

To improve formation

To increase resistance toward water

To remove wastes

Beer's law is followed in

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Flame photometry

Atomic absorption spectrophotometry

Mass spectrometry

Potentiometry

What is the minimum tensile strength of gray Cast Iron class 50

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25000 ibf /in²

50000 ibf/in²

100000 ibf/in²

900000 ib/in²

BCl3 is a planar molecule because B atom is.

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sp2 hybridized

Sp3 hybridized

sp hybridzed

sp3 d hybridized

The three dimensional silicate anion (Si2O5^2-)n is present in

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Beryl

Silica

Asbestos

Clays

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

Among the elements of third period, the element with lowest boiling point belongs to group.

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1

14

16

18

Which of the following basic process is involved in the separation of the complex mixture by chromatographic techique.

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Partition

Adsorptions

Ion exchange

All of the above processes

In each period, the most electropositive element belongs to group.

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18

17

1

2

The gases that are responsible for green house effect are.

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CO2 & CH4

CFC

N2O

All above

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

What corrosion occurs under organic coating on metals as fine wavy hairlines?

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Stray current corrosion

Microbiological corrosion

Filiform corrosion

Simple corrosion

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