Question # 1

Buffer solution are used to.

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Increase the pH

Resist the pH

Decrease the pH

None of above

Which of the following statement represent disadvantages of sanitary landfill

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Public opposition

Uneconomical

Health hazard

All above

Arrange the following in order of increasing boiling point.

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CH3OH < CH3Cl < RbCl < CH4

CHOH < CH4 < CH3Cl < RbCl

RbCl < CH3Cl < CH3OH < CH4

CH4 < CH3Cl < CH3OH < RbCl

Red brass contain about how many percent of zinc.

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20 %

15 %

30 %

25 %

Which of the following salt is colourless.

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Zn salt

Co salt

Ni salt

Mn salt

All the member of group III A are metals except.

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B

Ai

Ga

In

A process in which no heat enters leaves the system is called.

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Isochoric

Isobaric

Adiabatic

Reveraible

The temperature at which the vapour pressure becomes equal to external pressure is called.

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Saturation point

Critical temperature

Consolute temperature

Boiling point

Soft drinks and baby feeding bottles are generally made up

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Polyeater

Polyurethens

Polyamide

Polyetyrene

At constant temperature and pressure, the decrease in Gibbs free energy (F) in equal to

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Increase in entropy

Decrease in entropy

Reversible work done by the system

All types of work except the work of expansion

During the titration of weak acid against NaOH the conductance of the solution after the neutralization point.

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Is constant

Decreases

Varies irregularly

Increase

Setting of cement is improved by

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Lime stone

Clay

Gypsum

Water

The rate of a chemical reaction is proportional to the product of the active mean of the reactants, This is a statement of.

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Law of dynamic equilibrium

Le Chatlier's principle

Law of mass action

Solubility product principle

Which of the following elements has the highest value of second ionization energy.

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Lithum

Beryllium

Boron

Magnesium

Select an acidic amino acid

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Lysine

Cystine

Aspartic acid

Aminoacetic acid

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 common oxidation state of lanthanides is.

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+3

+2

+1

+4

In proper rotation (Cn) an object is rotated through an angle of.

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a/n radians

2n/n radians

3n/n radians

4n/n radians

By applying an external force the ionic solid can be easily broken to powder form so the ionic solid are highly

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Hard

Brittle

Tough

Soft

Which of the following parameter is not involved in calculations based on Born Haber Cycle.

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Ionization enthalpy

Electron gain enthalpy

Electronegativity

Bond dissociation energy

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Which of the following method is used to separate small molecules form the larges molecules from the larger molecules in diffusing through a membrane.

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Dialysis

HPLC

FPLC

TLC

TLC belongs to which of the following chromatographic techniques.

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Ion exchange

Partities chromatography

Adsorption chromatography

Gel permeation

Which of the following acids acts as acid waste from coal mines.

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HCl

HNO3

CH3COOH

H3PO4

Which of the following statements is not true with reference to ionic conductors.

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Ionic conductance is due to movement of the ions

It involves the transfer of matter

It involves oxidation reduction reactions

It decreases with rise in temperature.

The main constituents of ___________ are boron oxide and silica.

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Pyrex glass

Low silica glass

Soda lime glass

Super hard glass

A terpenoid which as an alcoholic group in the molecule is

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Citral

Camphor

Menthol

Carvone

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

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Sulphur

Phosphorus

Silocn

Magnesium

The juice is allowed to boil at lower temperatures to protect the sugar from

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Hardening

Solubility in water

Caramelization

Dwatering

Lewis concept explain the formation of

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Ionic bond

Covalent bond

Co-ordinate bond

Chemical bond

For an elementary reaction

2A + B ------------------- C + D

The molecularity of the reaction is.

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1

2+

3

4

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