Question # 1

The electrolytic method super passes all other methods due to.

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Furity

Cheapness

Easy available

All above

Sugar and common salt in a mixture can be separated through then process of.

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Sublimation

Distillation

Ion exchange

Crystallization from solution in ethanol

NH3 has a not dipole moment while BF3 has zero dipole moment Thsi is because.

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NH3 is not a planar molecule while BF3 is a planar molecule.

NH3 is a planar molecule, while BF3 is a planner molecule.

Fluorine is more electronetative than nitrogen

Born is more electronegative than nitrogen

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 pH of 0.001 N HCl is

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1

2

3

4

Which of the following cast iron is heat treated for ductility.

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Gray iron

Malleable iron

White iron

None of these

The half life period of any first order reaction.

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Is half the specific rate constant

Is independent of the initial concentration

Is always the same whatever the reaction

Is directly proportional to the initial concentration of the reactant

If there are only two components in a solution with mole fraction X_Aand X_Bthen which of the following relation is correct.

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X_A + X _B = 0

X _A + X _B > 1

XA = XB < 1

XA = 1 - XB

Variable electrovalency is due to the following reasons.

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Unstable configuration of core

Inset electron pair effect

All of above

None of above

The terpenoid present in oil of lemon grass is

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Citral

Geranial

Nerol

a- terpineol

Major principle underlying the sustainability of natural ecosystems is that they run on.

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Electric energy

Solar energy

Wind energy

None of the above

Monel metal is a alloy of Ni which constrains Ni uptown

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50%

60%

70%

80%

Cement is a mixture of

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Clay and clinker

Clay limestone and gypsum

Limestone and gypsum

Binder

A terpenoid which has as alcoholic group in the molecule is.

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Citral

Camphor

Menthol

Carvone

Magnalium is alloy of Aluminium which is used in

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Scientific apparatus

Aircraft parts

Rail road care

Boat machinery

The enrichment of chemical substance at the surface of a solid is called

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Adsorption

Absorption

Sorption

Isotherm

Maximum desirable concentration of fluorides according to international standard is.

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10-100 ppm

1 ppm

100-200 ppm

10-20 ppm

If the activation energy in the forwarded direction of an elementary step is 52 kj and the activation energy in the reverse direction is 74 kj. What is the energy of reaction Delta E for this step

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22 Kj

-22 kj

52 kj

-52 kj

In Glass of vitreous state solid the atoms are arranged in.

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Regular fashion

Random fashion

linear fashion

All of these

Lead pencil contain

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Lead

Lead sulphide

a mixture of lead and silica

graphite

When borax is strongly hented, it gives

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B2O4

Na2B4O7

NaBO2

NaBO2 + B2O3

An equilibrium the free energy change delta F for a reaction is.

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Maximum

Minimum

Zero

Negative

Which of the following elements has the highest value of IE.

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Na

K

Mg

Ca

Among oxides of nitrogen all are gases except.

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N2O5

N2O

NO

N2O3

Which of the following organic molecule is not aromatic.

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Benzene

Naphthalene

Anthracene

Cyclo-octatetraene

Which treatment is done with pulp before delivering it to paper making machine.

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Pulp is disperse din water to make slurry

Mechanical refining or heating of the fibers

Addition of chemical additives and recycled fibres from the waste paper plant

All above

Which of the following statements is not correct with respect to applications of H- bonding.

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It explains the usual b.p. and m.p of certain class of compound.

It explains the solubility of certain organic compounds in hydroxylic solvents

It explains the lack of ideal behavior in gases and solutions

It has stonrg influence on the configuration of certain molecules.

Which of the following statements in not correct with respect to the important characteristics of aromatic compounds.

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They are usually cyclic compounds

They are resistant to usual addition reactions

They usually undergo substitution reactions

They are less stable

Which parameter of a chemical reaction will change with the use of a catalyst.

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Delta F, change in free energy

Delta S, change in entropy

Delta E , change in internal energy

K, the rate constant

An auxochrome is a group which

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Absorbs in UV region

Absorbs in visible region

Absorbs in IR region

Increase absorption wavelength of chromophore

During the preparation of soap the liquid separated by distillation is

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Sodium hydroxide

Oil

Fats

Glycerol

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