Question # 1

Ionic bond are also forces called as.

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Polar bond

Electrovalent bond

None polar bond

Both A and B

Monomer of neoprene rubber to

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1-chloro 1,3- butadiene

2- chlro, 1,3-butadiene

2-Bromo -1,3- butadiene

2-Methyl 1,3-butadiene

Which of the following has the highest melting point.

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NaCl

KCl

MgO

BaO

Which of the following substances act as pollutant.

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Oils

Greases

Toxins

All above

Which one of the following does not exhibit paramegnetion.

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NO

NO2

CiO2

CIO-2

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temeperature between

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1100 ^o and 1200 ^oC

1200 ^o and 1300 ^oC

1400 ^o and 1500 ^oC

1900^o and 2000 ^oC

The process in which ore is heated generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points is called.

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calcination

Roasting

Froth floatation

Bessemerization

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

Ionic compounds in general possess both

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High melting point and non -directional bonds

High melting points and low boiling poinits

Directional bonds and low boiling points

High solubility in polar and non -polar bonds.

The value of an Einstein

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Is independent of wavelength

Decrease with increase in wavelength

Increase with increase in wavelength

Depends on the temperature of the absorbing system

What is the purpose of molybdenum in steel alloying.

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To increase dynamic and high temperature strength and hardness

To increase brittleness

To increase corrosion and resistance

All above

The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that.

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Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring.

The phenylamine molecule is too large to capture hydrogen ion easily

Phenylamine is much less soluble is water than is ammonia

The benzene ring has a tendency to increase the acidity of its substituents.

For a single -component system, the maximum degree of freedom in

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1

2

3

Between 3 and 6

Which of the following is an alloy of copper

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Brass

Bronze

Monel metal

All

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

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 elements display maximum tnedency to form P Pi - p PI multiple bonds with itself and with carbon and oxygen.

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N

p

Bi

As

A unit cell having dimension , a = b c, alpha, beta, gama = 90^o is known as.

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Cubic

Hexagonal

Orthorhombic

None of them

Pick out incorrect statement regarding HF

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It is used for making chlorofluorocarbon used as refrigerating fluids and as propellants in aerosols

It is used in making ASIF3 and synthetic cryolite

Aqueous HF is used for etchine glass

HF does not react with B2O3 even in presence of conc. H2SO4

Which of the following statements is not correct with the concept of Bronsted concept of acids and bases.

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An acid can donate a proton

A base can accept a proton

This concept has many bases that have OH- ions

This concept is more general

The osmotic pressure of a solution with definite composition.

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Varies directly as the volume and temperature.

Various inversely as the temperature.

Varies inversely as the volume and directly as the temperature.

None of the above

Which of the following equations represent linear free energy relationship.

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Hammett equation

Taft equation

Helmholtz equation

Differential equation

Which of the following is not related to the limitations of Bohr's model.

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It does not applicable to more than one electron system.

It does not explain the extra lines obtained in the H-spectrum

It considers the electron as particle

It considers the electron as a wave.

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware, etc. when mixed wiht cold conc. H2SO4

Which of the following element has six electrons in the valance shell but cannot exhibit a maximum co valency of six.

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Sulpher

Oxygen

Salenium

Both A and B

The emission of light in a biological reaction in known as.

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Fluorencence

Phosphoreacence

Biolumineacence

Phtolysis

In the electronic structure of acetic acid,the total number of shared and unshaped pair of electrons are respectively.

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16 ,8

8 ,4

12 ,8

8 ,12

In graph of atomic volume versus atomic weight the elements corresponding to peaks in the curve belong to.

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Group 1

Group 18

Group 4

Group 14

Which of the following is soluble in water.

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AgF

AgCl

AgBr

Ag I

Which of the following is a planar molecule.

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Acetone

Formic acid

Acetic acid

All above

Which of the following techniques is used for cleanup of samples prior to introduction into chromatographic column.

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Paper chromatography

TLC

Solvnent extraction

Solid phase extraction

Both C and D

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