Question # 1

Which of the following is a natural polymer

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Nylon

Leucite

Cellulose

Polystyrene

The bond angle between hybrid orbitals in methane is

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115.5^o

109.5^o

105,7^o

120^o

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

Select the correct IUPAC name for [FeF4(OH)2]-

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Diaquatrafluoriron (III) ion

Diaquateratrafluoriferrate (III) ion

Diaquatertrafluoroiron (I)

None of these

Which of the following acid radical gives chromyl chorate test.

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F-

I-

Cl-

Br-

Which of the following process is involved in nitrogen flotation

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Non symmetric fixation of nitrogen

Fixation by soil bacteria

Fixation by yeast

Fixation by blue green algae

All above

Disease caused by eating fish found in water contaminated with industrial waste having mercury is.

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Minamata disease

Bright's disease

Hashimoto's disease

Osteoaclerosis

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 high quantum yield reasons.

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Formation of reactive intermediates which may act as catalyst

The active molecules may collide with other molecules and activates these molecules.

The reaction may be exothermic and heat evolve may activate other molecule

The primary photo chemical process may be reversed

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 reciprocal of the coefficient of viscosity in called.

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Density

Specific gravity

Fluidity

Conductance

The formula of borax glass is.

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Na2B4O7 10H2O

Na2B4O7 5H2O

Na B4 O7

None of above

If steel is heated to a temperature well below red heated and is then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

When two atoms of hydrogen combine to form a molecule of hydrogen gas the energy of the molecule.

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higher than that of the separate atoms

Equal to that of the separate atoms

Lower than that of the separate atoms

Sometimes lower and sometime higher.

In Nano synthesis new unsual chemical reactions are due to.

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Non equilibrium system

Equilibrium system

Isothermal system

Adiabatic process

The binding site on ribosome t-RNA and m-RNA is provided by

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Polysome

Ribosomal RNA

Codone

DNA

Which of the following statement is related with CO.

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It is a colorless and tasteless gas

It has less affinity to words hemoglobin

It has a boiling point of -192 ^oC

It is a dangerous asphyxiant

How many varieties of commercial iron are known.

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1

2

4

3

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

The mole of photon is knonw as.

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Quantum

Einstein

Energy packet

None of the above

The colour of Ni2+ ion is.

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Blue

Green

deep green

Orange

Air pollution is not caused by

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Pollen grains

Hydroelectric power

Industries

automobiles

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

carbon monoxide is harmful to human beings as it.

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Is carcinogenic

Is antagonistic to CO2

Has higher affinity for haemoglobin as compared to oxygen

Is destructive to O3

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

Temporary hardness of water is due to.

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Bicarbonates of K

Bicarbonates of Na

Carbonates of Ca

Bicarbonates of Ca

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

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P

As

Bi

Sb

Which of the following process is not involved in the purification of bauxite.

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Bayer's process

Serpek's process

Hall's process

Goldsmith's process

Which of the following is the active ingredient in ordinary household bleach.

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HCl

Cl2

NaCl

NaCIO

Which is the following is not a buffer.

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H2CO3/HCO3

NH4Cl/NH4OH

CH3COOH/CH3COONa

NH3OH/CH3COOH

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