Question # 1

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

Which of the following does NOT react with sodium hydroxide solution.

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Fat

Vinegar

Ethanol

Water

The pKa of acetic acid is 4.74 which implies that.

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pH of 1N solution is 4.74

At pH 4.74 the dissociation of acetic acid is maximum

At pH 4.74 half of the acetic acid molecules are dissociated in the solution.

At pH 4.74 the dissociation of acetic acid is minimum.

Which of the following solution has pH= 11?

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1 X 10^-11 m NaOH

1 x 10^-11 m HCl

1 x 10^-3 M NaOH

1 X 10 ³ M NaOH

The reciprocal of the coefficient of viscosity in called.

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Density

Specific gravity

Fluidity

Conductance

Which of the following concentration term is used in respect of standard solutions.

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Normality

Formality

Molarity

All of above

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

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Mg²⁺

Co²⁺

Ni²⁺

Mn²⁺

The equation which relates the reaction rates and equilibrium constants of many reactions is known as.

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Taft equation

Hammett equation

Differential equation

Linear equation

The entropy of the universe

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Tends towards a maximum

Tend towards a maximum

Tends to be zero

Remains constatn

Which of the following salt is colourless.

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Zn salt

Co salt

Ni salt

Mn salt

What exactly is quantum dot

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A semiconductor nanostructure that confines the motion of conduction band electrons, valence band holes or excitation in all three spatial directions

The sharpest possible tip of an atomic force microscope

A fictional term used in science fiction for the endpoints of wormholes

Unexplained spots that appear electron microscopy images of nanostructures smaller than 1 nanometer

Which of the following statement is incorrect.

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An alloy is a mixture of two or more metals

An alloy is a mixture of two or more metal and non metal elements that have metallic properties

An alloy has a fixed composition

An amalgam is an alloy containing Hg

The change in the concentration of the reactant of product per units time is called.

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Order of the reaction

Melecularity of the reaction

Rate of reaction

None of the above

a- pinene hydrochloride on warming rdarranges to form bornyl chloride.The rearrangement is known as.

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Pinacol pinacolone

Hofinann

Wager Mecrwein

Wolff

Group IV A consist elements.

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3

4

5

6

The important condition for the formation of chemical bond is that.

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Their electron clouds should not diffuse

Both atoms should have high electron affinites.

Both atoms should have same electronegativities

The process should be accompanied by the lowering in potential energy.

The isotonic nucleotide X and Y have mass numbers 35 and 37 respectively if the atomic number of X is 17 the atomic number of Y will be.

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15

17

19

18

Which of the following is the third most abundant element in the nature.

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Oxygen

Sulphur

Aluminum

Hydrogen

The action of all the relations of all the organism to their environment is called

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Biology

Botany

Ecology

Archiology

Which of the following energy is trapped by the autotrophic organisms.

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Mechanical energy

Electrical energy

Radiant energy

Electronic energy

The 'shape' of molecule ." Xe F6 is.

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Pentagonal bipyramidal

Regular octahedral

Distorted octahedral

Square planar

What is the raw material of sugar industry.

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Sugar cane

Potato

Carrot

Sugar heat

Both A and C

PCRA stand for

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Pollution control research association

Petroleum conversation Research association

Petroleum control research association

All of above

Which of the following item is not symmetry element.

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Pllane of symmetry

Inversion centre

Improper rotation

Optical activity

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

Which of the following is not a property of Ni.

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it is a soft silvery white metal

It is malleable and ductile

It is highly magnetic

It has high electrical and thermal conductivities

In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.

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Ammonia

O2

N2

NO

in the system of designating wrought aluminum alloys the letter F that follows the number indicates what condition of the alloy.

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As fabricated

Calcined

Annealed

Strain hardened

Which of the following is diamagnetic

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O2

O2+

O2-

O2 ^2-

It is possible to distinguish between optical isomers.

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Using chemical tests

By mass spectrometry

By IR spectroscopy

By polarimetry

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