Question # 1

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

The proper number of significant figures in the number 0.0780 is.

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3

1

4

2

Which of the following steps is involved in quantitative analysis.

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Sampling

Conversion of the desired constituent into a suitable form per analysis.

Measurement of some physical or chemicals property, on which the determination is based.

All above steps

Which halide of cesium will be highly ionic in nature.

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K+

Ag+

Rb+

Ca+

What is caustic potash

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NaOH

KOH

NaCl

KCl

All the member of group III A are metals except.

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B

Ai

Ga

In

According to SHAH concept the Lewis bases were classified on the basis os.

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Charge ion size

Polarization consideration

Electron and co coordinating ability

All of above

Which of the following organic molecule is not aromatic.

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Benzene

Naphthalene

Anthracene

Cyclo-octatetraene

Which of the following radical is not a member of II group.

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Cu²⁺

Cd²⁺

Ba³⁺

K+

The constant temperature and pressure,the rates of effusion of various gases vary inversely as square root of their denature. This is a statement of.

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Boyle's law

Charles's law

Graham's law

Daltons's law

At the some temperature 0.1 M solution of urea is isotonic with.

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0.1 M glucose solution

0.1 M NaCl solution

0.1 M urea solution

0.1 M BaCl2 solution

Pi bond is formed

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By the overlapping of atomic orbitals on internuclear axis

By transference of electrons

By sidewise overlapping to half filled p orbitals

By overlapping of s-orbitals with p orbitals

Which of the following is a triphenylmethane dye.

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Auramine G

Crystal violes

Fluorescein

Fast green O

Which one of the following does not exhibit paramegnetion.

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NO

NO2

CiO2

CIO-2

The cooling of molten urea by air in the tower is called.

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Prilling

Evaporation

Condensation

Distillation

Hydrometallurgy of copper involves extraction of copper from poor ores by which process.

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Dry process

Wet process

Both dry and wet process

None of these

Environmental pollution effects.

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Biotic component

Plants only

Humans only

Both biotic and abiotic components of environment

Boric acid is added to glass because is.

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Makes the glass opalescent

Reduces the coefficient of expansion

Makes the glass brittle

Increase refractive index of the glass.

Monomer of natural rubber is

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1,3-Butadiene

2-Methyl -1,3-butadiene

1,2 -Butadiene

1,3 - Pentadiene

What is the most undesirable of all the elements commonly found in steels.

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Sulphur

Phosphorus

Silocn

Magnesium

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

How many varieties of commercial iron are known.

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1

2

4

3

The forces which holds the atoms together in a molecule is called

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Ionic bond

Covalent bond

Co ordinate bond

Chemical bond

Which of the following substance act as photochemical oxidant

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Ozone

NOx

peroxyacetyl nitrate

All above

Dull red flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

The chrome molybdenum steels contain how many percent of molybdenum

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0.10

0.20

0.30

0.40

The atomic number of Potassium is 19 and that of manganese is 25. Although the coloured of MnO4 is dark violet yet the K+ is colourles.. This is due to the fact that

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Mn is a transition element while K+ is not

[MnO4]is negatively charged while K+ has a positive charge

The effective atomicnumebr of Mn is [MnO4] is 26 while for K+ the atomic number is 18

The Mn in a high positive oxidation state allows charge transfer transitions

The solution of NaOH pH -10.46 contain [OH-]

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2.0 X. 10^-4

4.6 X 10^-4

4.6 X 10^-2

4.6 X 10^-3

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

Which of the following basic process is involved in the separation of the complex mixture by chromatographic techique.

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Partition

Adsorptions

Ion exchange

All of the above processes

Which of the following process is a source of nuclear pollution.

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Uranium mining

Uranium processing

Reactor waste

All above

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