Question # 1

Which of the following analytical technique is used for the separation of an interfering substance or analyte from the mixture.

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Precipitation

Distillation

Electrode position

All above these

The number of Glass products now manufactured is.

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25,000

75,000

50,000

All of these

Who was the first scientist to describe that substance having Nano dimensions possess altogether different and unique properties.

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Richard Feynamann

Erick Drexler

Archimedes

Michael Faraday

Which of the following statement is not true regarding Open Hearth process.

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No iron is lost

The process is economical and simple

Steel obtained is of high quality

Scrap iron cannot be used in this process.

Which of the following is strongest reducing agent.

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Be

Mg

Ca

Sr

Lewis concept explain the formation of

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Ionic bond

Covalent bond

Co-ordinate bond

Chemical bond

B.P of heavy water is

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equal to that of ordinary water

greater than that of ordinary water

Less than that of ordinary water

equal to that of distilled water

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

Which of the following pair on aldol condensation followed by dehydration gives methyl vinyl ketone.

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HCHO and CH3COCH3

HCHO and CH3CHO

CH3CHO and CH3CHO

CH3COCH3 and CH3COCH3

Commercial detergents contain mainly ___________

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RCOON

RONa

RSNa

All above

VBT does not edplain

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Absorption spectra

Color of transition metal ion

Heat of formation

All above

Bond angle is minimum in

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H2O

CO2

NH3

CH4

Oxytocin, a pituitary hormone to

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Amino acid

Polypeptide

Protein

Conjugated protein

The molecule returns from the first excited triplet sate to the ground state singlet. The light emitted in known as.

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Inter system crossing

Phosphorescence

Fiuoreacence

Quenching

Which of the following play significant role in depletion of ozone layer.

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of above

The following ceramic product is mostly used as pigment in paints.

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TiO2

SiO2

uo2

ZrO2

Formula of orthophosphoric acid

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H2PO4

H3PO2

H2P2O5

The plate height is the length of the column divide by

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Length of the column

Width of the column

Number of theoretical plates

Number of components of the mixture.

Which of the following methods gives the number average molecular weight of a polymer.

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Light scattering method

Osmotic method

Sedimentation equilibrium method

Viscosity method

Which parameter of a chemical reaction will change with the use of a catalyst.

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Delta F, change in free energy

Delta S, change in entropy

Delta E , change in internal energy

K, the rate constant

Which of the following acid radical gives chromyl chorate test.

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F-

I-

Cl-

Br-

Urea an enzyme used to estimate urea is a

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Hydrolytic enzyme

Oxidative enzyme

Reductive enzyme

Iso me rising enzyme

Which of the following cast irons is a high carbon silicon alloy.

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Gray iron

White iron

Malleable iron

Alloy iron

Which of the following statement is not related with direct use of solar energy.

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It is used for space heating of buildings

It can be used to produce electrical power using photovoltaic cells

It can be used to produce hydrogen gas

It can be used start motor vehicle

Lime water is an aqueous solution of.

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MgSO4

Ca (OH)2

CaCO3

CaSO4

The sample characteristics affecting the weight loss curve include.

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Amount of sample

Sample particle site

Heat of decomposition reactions

All

The variation of enthalpy of reaction with temperature is given by.

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Hesse's law

Clasisus Clapayron equation

Kirchoffs equation

Arrhenious equation.

Which of the following a -amino acid is not capable of exhibiting optical isomerism.

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Glycine

Leucine

Arginine

Alanine

Which of the following process is not sorbent separation technolgy.

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Penex

Parex

Molex

Olex

__________ is used for fruits, vegetables and tobacco

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Potassium Chloride

Potassium Sulphate

Potassium nitraite

All above

According to recent view which is the correct representation of hydrated proton in aqueous solutions.

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H+

H9O3+

H9O4+

H2O+

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