Question # 1

Deviation in a particular measurement is the difference between the measured value and the average value The arithmetic mean of the different deviations observed in several measurements of the same quantity is known as.

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The standard deviation

The average deviation

Relative mean deviation

variance

Which of the following extract is used for wet tests of acid radicals.

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Calcium carbonate extract

Sodium iodide extract

Sodium carbonate extract

Ammonium carbonate extract

Arrange the hydrides of group 15 in the correct order of reducing nature.

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NH3 < PH3 < AsH3 < Sb H3 < BiH3

NH3 > PH3 >AsH3 >Sb H3 > BiH3

PH3 < AsH3 < SbH3 < BiH3 < NH3

PH3 > AsH3 > SbH3 > BiH3 > NH3

Which statement is false.

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If a reaction is thermodynamically spontaneous it may occur rapidly

If a reaction is thermodynamically spontaneous it may occur slowly.

Activation energy is a kinetic quantity rather than a thermodynamic quantity.

If a reaction is thermodynamics spontaneous, it must have a low activation energy.

Which of the following statement is not related with nitric oxide.

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It is a colorless and odourless gas

It is produced largely by fuel combustion

It is a brown pungent gas

It is oxidized to NO2

The function of boiling the sodium extract with conc. HNO3 before testing the halogens is

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To make solution clear

To make the solution acidic

To bring common ion effect

To destroy CN- and S2- ion

Which of the following statements is not true with reference to ionic conductors.

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Ionic conductance is due to movement of the ions

It involves the transfer of matter

It involves oxidation reduction reactions

It decreases with rise in temperature.

The coordination number of closely packed hexagonal is.

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4

6

8

12

Which of the following elements of group 15 is a typical metal.

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P

As

Bi

Sb

Chemical and physical properties of metal nano particles of atoms were observed to change periodically depending upon

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Number of atoms in a particle

Shape of particle

type of organization

All of the above

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide cementite

Graphite

Partly as iron carbide and partly as graphite

Combination of a -amino acid through which linkages results result in formation of protein

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Ester linkage

Glycosidic linkage

Lactum linkage

Peptide linkage

The one in which the acceptor atom is of low positive charge, Large size and has several outer electrons which can be easily excited is a.

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Soft base

Hard Base

Soft acid

Hard acid

Which of the following is the major process when neopentyl bromide is dehydrogenate with alcoholic potash.

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2- methyl -1- butene

2- methyl- 1- butene

2,3 -dimethyl butene

2- butene

The element with atomic numebr greater than 100 are known as

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Trans uranium elements

Trans fermium elements

Actinides

Lanthanides

Which of the following phenomena is not explained by the classical mechanics.

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Black body radiation

Photoelectric effect

Atomic and molecular spectra

Heat capacities of solids

All of the above

Which of the following factor is involved in band boarding that occur in column chromatography.

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Number of theoretical plates

Eddy diffusion

In phase mass transfer

All above

The normality of 2.3 M H2SO4 solution is.

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0.46 N

0.23 N

2.3 N

4.6 N

Drying agent which react with CO2 and removes water vapours is.

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CaO

CaCl2

CaCO3

Ca(NO3)2

The diameter of fly ash particles is._________ micro meter

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5-10

10-20

20-30

100

Which of the following configuration of an ionic species represents psedue noble gas configuration.

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ns2

ns2 np6

ns2 np6 nd 10

ns2 np3

C is -2 butene on reaction with bromino give 2,3 -dibromobutane which is

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

Which of the following compounds combines with hemoglobin.

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CO2

CO

NO

N2

A terpenoid which as an alcoholic group in the molecule is

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Citral

Camphor

Menthol

Carvone

The following alloys are the chief alloys that are die cast except.

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Zinc alloys

Magnesium alloys

Manganese alloys

Nickel alloys

The sugar present in RNA is

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D- ribose

D-Arabinose

D-Glucose

Deoxyribose

Most effective pesticide is

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Carbonates

Organophosphates

Organ chlorines

All of these

The state of hybridization of Xe in Xe F6 are

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sp2

sp3

sp3 d

dsp3

Which of the following makes the motion of perpetual motion machine a physical impossibility.

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First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

The Boltzmann law

Green houses are responsible for keeping our plant warm and sustaining life on the earth.

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CO2 & water vapours

CO2 & CFC

CO2 & H2O

CO2 & CH4

The theoretical plate in chromatography is represented by how many equilibrium step

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One

Two

Three

Four

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