Question # 1

Which of the following statement is not true in case of catalytic reforming.

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High temperature results in loss of reformate yield

High naphthenic stock require high space velocity

Presence of water decrease the hydrocracking activity.

None of above

Which is the second most abundant element occurring the earth crust.

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Iron

Cu

Cr

Ni

The half life for a first order reactions 32 s, What was the original concertation if after 2.0 minutes, the reactant concentration is 0.062 M.

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0.84 M

0.069 M

0.091 M

0.075 M

The relative populations of gourd state and excited state populations at a given flame temperature can be estimated using.

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Boltzmann distribution law

Maxwell law

Lambertie law

Beer's law

Recrystallization is the most common technique of purification of solid organic substances Which of the following statements is not related with characteristics of a suitable solvent.

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It dissolves the substance on heating

It readily allows it to separate out in the form of crystal on cooling

It does not react chemically with substance

It does dissolve the impurities.

Which of the following statements correct regarding copper.

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It is used in electroplating

Its salts are used as insecticides

Its salts are used as coloring materials

All are correct

Urea is fertilizer

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Nitrogen fertilizer

Potash fertilizer

Phosphorous fertilizer

Complete fertilizer

In the purification of bauxite , the ore is fused with sodium carbonate in the process

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Baeyer's process

Hall's process

Serpeck's process

Any of above

The inert gases Ar, Kr and Ke form compounds with water at low temperature and high pressure. These compounds are called.

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Halides

Hydrates

Clathrates

All of above

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

Xe reacts directly with

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O2

Cl2

F2

Br2

What field of study encompasses the procurement and production of metals.

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Metallury

Geology

Metagraphy

Nanochemistry

Acid rain is caused due to increase in the concentration of _______ in the atmosphere

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Ozone and dust

CO2 and CO

SO3 and CO

SO2 and NO2

Silicon bronze contains how many percent of silicon.

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96%

3%

1 %

69 %

Which of the following statement is not correct with respect to electrometric effect.

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It is permanent effect

It is brought into play instantaneously at the demand of attacking reagent

It proceeds a polar addition reaction

The original electronic condition is restored after the removal of tacking regent.

Pick out the incorrect statement for CIF3

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It has trigonal planar geometry

It is used to make gaseous UF6 which is useful in making enriched U-235 fuel

It is used as powerful fluorinating agent for inorganic compounds

CIF2 has been used as fuel in short range rockets reating with hydrazine.

Which of the following has the highest melting point.

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NaCl

KCl

MgO

BaO

In order to increase the rate of the reaction one should.

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Increase the concentration of products

Decrease the concentration of reactants

Decreases the concentration of products

Both C and D statement are correct

Hydrolysis of protein gives

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a -amino acid only

b-amino acids only

gama amino acid only

A mixture of all of these

The vapour pressure of a liquid

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Always increase's with temperature

Always decreases with temperature

Is independent of temperature

Increase up to the boiling point

The concentration required to give a signal equal to three times the standard deviation of the baseline is called.

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Sensitivity

Detection limit

Signal to noise ratio

None of the above

Glass electrode cannot be used to measure the pH of pure.

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Acetic acid

Ethyl alcohol

Gelatin

All above

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

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

A salt solution is treated with chloroform drops.Then it is shaken with chlorine water, chloroform layer become violet solution contains.

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NO2 ion

NO3 ion

Br ion

I- ion

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

The main active contaminants of uranium processing are.

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U - 235

U-238

Pu -234

All above

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

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Ethanal

Ethanoic acid

Ethanol

Ethync

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.

The common ligands can be arranged in order of their increasing splitting power to cause d-orbitals splitting. This series is called as.

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Electro-chemical

Spectro -chemical

Physico-chemical

Spectro -electrical

Co enzyme cna be separated from enzyme by

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Precipitation

Dalysis

Hydrolysis

Distillation

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