Question # 1

Which of the following source is commonly used as excitation source in fluorimeter.

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Tungsten lamp

Mercury vapour lamp

Nernst vapur lamp

Radio souse

Which of the following statement is false regarding lyphilic sols.

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The colloidal particles show a linking for the dispersion medium

These are generally easy to prepare

These are more stable than lyophobic sols

The stability of the sols is mainly due to the electrical double layer

Ethylene belongs to.

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C_2v group

D_2h group

C₂ group

D_ah group

For a given mass of a gas at constant temperature, if the value V becomes a times, the pressure will become.

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3P

P/3

9P

3P/T

What element is the most abundant by mass in the Earth's crust.

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Fe

H

O

K

Commercial or the phosphoric acid is pure.

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37.0%

82.98%

88.25%

90.12%

Yellow green flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

An Ideal gas is one which obeys all the gas law at.

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Low pressure

High Pressure

Low and High temperature

All condition of pressure and temperate re

Heisenberg's uncertainty principle precludes the exact simultaneous measurement of.

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Velocity and energy

Velocity and time

Charge density and probability

Position and momentum

Which of the following unit cells has least symmetry.

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Monocline

Cubic

Triclinic

Tetragona

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.

H2SO4 acts as gent

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Reducing

Oxidizing

Both A and B

None of above

Which of the following analytical technique is not concerned with atomic spectroscopy.

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Flame photometry

Flame emission spectrometry

Atomic absorption spectrometry

I-R spectrophotometry

The principal quantum number determines the overall size of the orbital and energy of the electron when it is associated with the orbital.It may have the values.

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n = 1,3,5.........infinity

n= 2,4,6................infinity

n = 1,2,3,4..............infinity

None of the abvoe

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 reactions is employed to produce ozone in the laboratory.

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Exposure of air to UV light

Reaction of F2 with H2O at low temperature

Reaction SO2 with H2O2

Passage of silent electric discharge through oxygen

Which of the following is not true as compared with alkaline earth metals.

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Alkali metals are more reactive

Alkali metals have lower density

Alkali metals are more electro positiveness

Alkali metals have stronger metallic bonds

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

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

The minimum amount of energy that the reacting molecules must posses at the time of collations in under to produce effective collisions is called.

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Free energy

Threshold energy

Activation energy

External energy

Which of the following is an example of molecular solids.

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MgO

ZnO

Ice

Graphite

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

Fertilizers are classified into

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Two major categories

Three major categories

Four major categories

None of above

The glow of the yellow phosphorous as a result of slow oxidation in air is called.

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Chemiluminescene

Luminescence

Biolumineacence

Photolysis

Potassium crystallizes in a body centered lattice. Hence, the coordination number of potassium in potassium metal is.

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4

6

8

12

Granulated sugar containing._____________

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Glucose

Fructose

Maltose

Sucrose

Which of the following phenomenon are driven by solar energy.

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Winds

Water cycle

Production of biomass

All above

Which one of the following is natural polymer.

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Starch

Nylon-6

Neoprene

Buna-S, SBR

Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called.

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Glass wool

Safety glass

Optical glass

Jena glass

The common oxidation state of elements of group V A is.

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-3

+3

+5

Any above

Albumin is classified as

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Simple protein

Conjugated protein

Lipoprotein

Derived protein

Which of the following oxide formed in appreciable quantity in the atmosphere.

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NO

NO2

N2O

All above

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