Question # 1

Branch of chemistry that deals with the basic principles governing energy changes during various processes is called.

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Wave mechanics

Chemical kinetics

Chemical thermodynamics

Electro chemistry

Which of the following is the cause of Brownian movement of colloidal particles.

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Convection currents int he fluid

Bombardment by the molecules of the dispersion medium

Setting of dispersed phase under gravity.

Thermal gradient in the medium

The increase in boiling points of noble gases from He to Xe is due to the

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Decreases in ionization energy

Increases in polarizability

Increase in electron affinity

Increase in atomic volume

Among the elements of third period, the element with lowest boiling point belongs to group.

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1

14

16

18

In the reaction RCO2Na + Na OH (CaO) ______ RH, we eliminate carboxylate group as.

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CO2

Na2CO3

-CO

CaCO3

Petrol can be saved by

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Driving at a constant and moderate speed

Ensuring correct type pressure

Switching off the engine at traffic lights

All of these

Hybridization involves.

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Orbitals of same atom with slightly different energies.

Orbitals of different atoms, but with equal energies.

Orbitals of the same atom but with widely different energies.

Orbitals of different atoms with different energies.

Hemimorphite is an example of.

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Orthosilicate

Pyrosilicate

Cyclic silicate

Meta silicate

The number of degrees of freedom and number of components for a system of containing undissolved salt , in equilibrium with water vapor are.

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2,2

3 , 2

1 , 1

1 , 2

Enfleurage process is used to extract the essential oils from

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Back of plant

Seeds of plant

Leaves of plant

Flowers of plant

The concept of telluric helisx was developed by

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Lother meyer

A.E. de Chancourtois

New lands

Doberieiner

If diesel has cetane number of 50 then the diesel index will be.

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36

46

56

66

Which among the following is a false statement.

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SiO2 has a structure similar to that of CO2

Natural Si exists only in the combined state

Si can be prepared by reducing SiO2 with Mg

Si does not exist in graphite like structure, but exists only ni diamond like structure.

The total number of crystal systems and the number of Bra via is lattices are.

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7,7

7,14

14,7

14,28

Hot isostatic pressing is not a viable option if the chief criterion is

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Strength without gram growth

Lost cost

Zero porosity

Make it hard

Which of the following is soluble in water.

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AgF

AgCl

AgBr

Ag I

Inert pair effect is best shown by

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Si

Z

Sn

Pb

The property measured in TGA is

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Change in weight

Rate of change in weight

Heat envolved and absorbed

Change of temperature.

In the formation of H2O molecule, the oxygen atom makes use of.

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2p orbitals

sp hybrid orbitals

Sp2 hybrid orbitals

Sp3 hybrid orbitals

Perdisulphuric acid is.

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Marshal acid

Caro acid

None of above

Any of above

Which of the following gas is lightest.

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Dihydrogen

Helium

Dinitrogen

Dioxygen

The pair of molecules or ions having identical geometry is.

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BCl3, PCl3

BF3, NH3

CHCl3, CCl4

SiCl4, CCl4

Which of the following is not an extensive property.

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Work

Entropy

Free energy

Volume

Which of the following methods does not give the weight average molecular weight.

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Sedimentation equilibrium

Sedimentation velocity

Light scattering

Osmotic method

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

NH4OH in the presence of H2S is used as a group reagent for which of the following group.

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Group I

Group II

Group III

Group IV

Reaction in which molecules absorbing light do not themselves react but induce other moleculaes to react are called.

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Chain reactions

Photosenaitized reactions

Reversible reactions

Free radical reactions

The vapours attacks the eyes and mucous membrane of nose and throat

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F

Cl

I

Br

C is -2 butene on reaction with bromino give 2,3 -dibromobutane which is

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

'A line, a point or a plane about which a symmetry operation is performed, is known as.

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Symmetry operation

Symmetry element

Reflection

Inversion

Which of the following acid radical is not interfering.

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Phosphate

Borate

Flouride

Sulphate

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