Question # 1

Which of the following steps is involved in quantitative analysis.

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Sampling

Conversion of the desired constituent into a suitable form per analysis.

Measurement of some physical or chemicals property, on which the determination is based.

All above steps

According to SHAB, Lewis acid are divided into.

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Two classes

Three classes

Four classes

None of above

Oxidative enzymes are responsible for

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Biological processes

Biological oxidation

Biological hydrolysis

Biological isomerisation

Which of the following method is used to separate small molecules form the larges molecules from the larger molecules in diffusing through a membrane.

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Dialysis

HPLC

FPLC

TLC

The percentage of s-character in the hybrid orbitals sp, sp2 and sp3 follows the pattern.

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sp3 > sp2 > sp

sp > sp2 > sp3

sp = sp2 >sp3

sp = sp2 =sp3

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

The most harmful components of incomplete combination are generally groped as particulate polyclic matter organic (PPOM) These materials are derivatives of .

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Benzene

Naphthalene

Benz a pyrene

None of the above

Which of the following techniques are used for minimizing water pollution.

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Stabilization of ecosystem

Recharge of the waste

Waste treatment

All above

Dull red flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

Cryolite is used in the electrolytic extraction of aluminium to.

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Obtain more aluminium

Reduce alumina

Protective electrodes

Dissolve bauxite and increase the electrical conductivity

Attention should be focused on qualitative changes in particle properties as a function of.

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Particle numebrs

Particle mass

Particle size

Particle density

Gutta percha is

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Cis poly imprene

Trans -polyisoprene

Polyethylene

Polyisobutylene

The study of coiled long peptide chains of protein to give a 3 dimensional structure is the study of.

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Primary structure

Secondary structure.

Tertiary structure

Quaternary structure.

Which is not a pollutant from the exhaust of motor.

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Hydrocarbons

Carbon monoxide

NOx

Fly ash

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

Form electron deficient compounds

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B

AI

Both B and AI

None of above

HS- is a conjugate base of.

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S2-

H2S

H2SO3

H2SO4

Which of the following reactions have small enthalpy change.

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NaOH with HCl

NaOH with CH3 COOH

HCl with NH4 OH

None of these

H2SO4 is manufactured by

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The lead chamber process

The contact process

Both A and B

The Ostwald's process

CFT can very well explain

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Color

Magnetic properties

Spectra of transition metal

All

Xenon diflouride is obtained by irradiating a mixture of xenon and fluorine with light from a high pressure.

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Mercury arc

Tungeston arc

Xenon arc

None of above

Which of the following exists as polymeric chains in solid state.

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Sr Cl2

Ba Cl2

MgCl2

BeCl2

Rutherford proposed the nuclear model of the atom to account for the result of experiments in which the alpha particles are scattered from metal foils.Which of the following statements in not related to Rutherford observation.

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An atom consists of central core or nucleus around which the protons exist.

The nucleus has most of the mass of the atom

the nucleus consists of protons and neutrons.

Each distinct atom has a specific number of protons.

Which of the following elements has the highest value of second ionization energy.

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Lithum

Beryllium

Boron

Magnesium

Which of the following interaction is the strong.

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Dipole -dipole

Ion induced dipole

Ion -dipole

Dipole induced diple

Which of the following pollutants results from chemicals petroleum and paper industries.

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SO2

CO

Hydrocarbons

All above

Inert pair effect is that

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When an element shows incertness in chemical combination

When higher oxidation state is more stable than lower oxidation state

When an elecrron pair is present on the atom of an element

When two s -electrons or outermost shell remain paired and do not participate in bonding.

Polyamide jinkage is present in

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Nylon

Silk

Protein

All of these

During reaction of copper with aqueous solution of silver nitrate

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Silver atoms are reduced

Cu2+ ions are reduced

Silver ions are reduced

No³ ions are reduced

Which of the following characteristics of adsorption is wrong.

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Adsorptoin on solids is reversible in nature

Adsorption, in general increase with increase in temperature.

Adsorption is generally selective in nature.

Both enthalpy and entropy of adsorption are negative

Which of the following compounds has highest dipole moment.

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Dichloromethane

Chloroform

Chloromathane

All above

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