Question # 1

Which of the following process is involved in the purification of crude metals.

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Liquation process

Oxidation process

Distillation process

Electro refining

Which of the following is the second anciently known metal.

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Nickel

Copper

Gold

Silver

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

The electrode Pt/Fe2+ (C1) Fe 3+ (C2) belong to the type.

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Gas electrodes

Inert metal electrodes

Magam electrodes

Metal metal insoluble salt electrode

Which of the following statements regarding covalent bond is false.

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The electrons are shared between atoms.

The bond in non -directional

The strength of the bond depend upon the extent of overlapping

The bond formed may be polar or non-polar

Which of the following chemical strong oxidizing agent is used in COD test.

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KMnO4

H2SO4

CH3COOH

K2Cr2O7

Which one of the following ions is colourless.

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Cu+

Co2+

Ni2+

Fe3+

Which of the following polymers is chlorinated.

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Orlon

Neoprene

Dacron

None of these

The expected specific waste of paper and allied products industry is.

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Chemicals

Paper and fibre residues

Links

All above

Which of the following is atmospheric pollutant.

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CO2

CO

O2

N2

_______ is heat treatment cycle that prevents glass from harmful stress.

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Forming

Annealing

Batching

None of these

The branch of chemistry dealing with the study of reactions in the Uv visible region of the spectrum in known as.

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Kinetics

Photo chemistry

Surface chemistry

Catalysis

Soap is soluble in grease because it

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Is non polar

Has a hydrophobic head

Has a hydrophobic tail

Has an ionic head and a hydrocarbon tail

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

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

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Voltmeter

Potentiometer

pH Meter

Goniometer

In Pakistan the total production of glass is over ________ tons per year.

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800

8000

80,000

None of these

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

Which of the following are neutral ligands.

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NH3

H2O

CO & NO

All of above

Process of separating the racemic mixture into optically active isomers is known as.

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Resolution

Racemisation

Walden inversion

Epimerization

Which of the following reaction cannot be used for the synthesis of a amino acids.

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Gabriel phthalimide

Streckers synthesis

Sorensen synthesis

Schmidt synthesis

The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of.

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6000 A^o

10000 A^o

4000 A^o

5000 A^o

The aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

Each of the following compound react with Grignard's reagent to form alkane exxcept.

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Ethanal

Ethanoic acid

Ethanol

Ethync

Which of the following compounds shows optical activity

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Lactic acid

Maltose

Glucose

All above

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

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

Which of the following element has six electrons in the valence shell but cannot exhibit a maximum co valency of six.

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Sulphur

Oxygen

Selenium

Both A and B

A steel cannot qualify for stainless prefix until it has at least how many percent of chromium.

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10 %

20 %

5 %

30 %

The substance added to the soil to provide one or more nutrient elements essential for plants growth are called.

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Growth hormones

Fertilizers

Salts

Minerals

The matrix is usually in the form of.

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Sand

Limestone

Rocks

All

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