Question # 1

Low quality steels with an M. Suffix on the designation intended for non structural application is classified as.

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Merchant quality

Commercial quality

Drawing quality

Low quality

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

Beillstein test is used for.

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Cl

N2

CO2

Na

Which of the following can act both as a Bronsted acid and a Bronsted base.

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Na2CO3

OH-

HCO3-

NH3

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

Lime water is an aqueous solution of.

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MgSO4

Ca (OH)2

CaCO3

CaSO4

The Hall process involves the reduction of Al2O3 to aluminium by

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Carbon

Carbon monoxide

Molecular hydrogen

Electrolysis

The electrical resistance of stainless steels can be as much as______ time that of carbon steel.

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5

6

10-

15

The decrease in electron density at one position accompanied by a corresponding increase at other position is called.

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Inductive effect

Asymmetric effect

Electromeric effect

Resonance effect

Which of the following statement is not correct n respect of Arrhenius concept.

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The concept is applicable only for aqueous systems.

Neutralization takes place in aqueous mediam only

TH+ ion cannot remain as such in water

This concept is applicable for non aqueous system only.

The force responsible for dissolution of ionic compounds in water are

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Hydrogen bonds

Ion dipole forces

Ionic bonds

Van Der Waal forces

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

Drained sewage has B.O.D.

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More than that of water

Less than that of water

Equal to that of water

None of the above

Which of the following would decompose at lowest temperature.

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MgCO3

SrCO3

BaCO3

CaCO3

Which of the following orbitals has maximum penetration effect.

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s

p

d

f

Which of the following is not true for metalloids.

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They are borderline elements

They usually act as electron during with non metals.

B, Si, and Ge

They are all solids at room temperature.

Essential oils are purified by which of the following methods.

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Steam distillation

Sublimation

Crystallization

Fractional crystallization

An equilibrium the free energy change delta F for a reaction is.

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Maximum

Minimum

Zero

Negative

Metal are

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Hard

Ductile

Malleable

All

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 wiht cold conc. H2SO4

Helium is used for

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The preservation of food

Filling electrical transformer

Pressuring agent in rockets

All of above

Cement containing higher percentage of gypsum than required.

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Sets slowly

Sets repidly

_{Does not set at all}

Has no effect

The secondary valency of Conc. CoCl3. 6NH3.

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2

4

6

8

The ions Sc3+ , Ca2+ and K+ have same electronic configuration as that of.

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Neon

Argon

Krypton

Xenon

A well packed column may hve

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100 plates /m

1000 plates /m

10 plates /m

10,000 plates/m

Which of the following is soluble in water.

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AgF

AgCl

AgBr

Ag I

Chlorofluorocarbon are widely used as coolants in.

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Air conditioners

Clearing solvents

Aerosol propellant's

All above

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 steroid which plays an important role in carbohydrate metabolism is.

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Oestrone

Progestrrone.

Androsterone

Cortisone

The hydrogen bond is strongest in.

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O - H .............S

S - H.............O

F- H....................F

F - H...............O

The aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

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