Question # 1

The high oxidizing power of halogens is favored by.

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Low heat od dissociation of X2

A high electron affinity of the atom

A higher hydration energy of the ion

All of above

A closed system is one which can exchange with surrounding.

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Matter but not energy

Energy but not matter

Both matter and energy

Neither matter nor energy

The emission of light in a biological reaction is known as

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Fluorescence

Phosphorescence

Bioluminescence

Photolysia

The electrical conductivity of a nano tube is __________ times that of copper.

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10

100

1000

1/100

What is the advantage of quench hardening?

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Imporoved strength

Hardness

Wear characteristics

All of the choice

CFT was originally applied to.

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Ionic crystal

Liquid crystal

Solid crystal

All above

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

The substance added to the soil in very small amounts are called.

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Macronutrients

Micronutrients

Fertilizers

None of these

The internal resistance to flow possessed by a liquid is called its.

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Fluidity

Viscosity

Surface tension

Turbidity

Which of the following oxides is amphoteric..

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CaO

BaO

BeO

MgO

The most convenient and has nearest approach to a universal pH measurement

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pH strips

pH indicator

The emf method

The colorimetric

For a compound to act as a dye it must have

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A suitable colour

Ability to fix to fibre

Both A and B

None of these

Which of the following is the most suitable catalyst for ammonia synthesis.

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Pt

ZnO+ Cr2O3

Fe in fused mixture of Al2O3 + SiO2+ MgO

All of above

Which of the following cells is used to produce electricity from chemical reaction

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Electroytic cell

Galvanic cell

Voltaic cell

Fuel cell

Both C and D

Boron does not form B3+ ion because.

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It has small size and high ionization energy

It has high electromagnetically

It has high charge density

None of the above

In which of the following techniques the solvated molecules are separated according to their size by their ability to penetrate a sieve like structure.

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Adsorption chromatography

Partition chromatography

Ion exchange chromatography

Gel permeation chromatography

The total number of bond pairs around sulphur and total number of lone pairs around oxygen atoms in the Lewis structure of sulphate ion are respectively.

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4, 12

8,12

12,4

6 ,12

Group IV A consist of elements

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3

4

5

6

According to SHAH concept the Lewis bases were classified on the basis os.

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Charge ion size

Polarization consideration

Electron and co coordinating ability

All of above

Which of the following statements is not correct.

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The conductance of one cm3 of a material is called specific conductance

Specific conductance increase while equivalent conductance decreases on progressive dilution

The limiting equivalent conductance of weak electrolytes cannot be determined by extrapolation of the plot of A against concentration

The conductivity of metals is due to the movement of elctrons.

Which of the following is not true for metalloids.

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They are borderline elements

They usually act as electron during with non metals.

B, Si, and Ge

They are all solids at room temperature.

The most important problem regarding nano chemistry

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Elucidation of relationship between also and chemical reactivity of particle

Determination of size of particle

Determination of reactivity of particle

Determination of physical properties of nano particles.

All the halogen form oxyacide, except

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Florine

Chlorine

Bromine

Iodine

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

The phenomenon of x-ray diffraction was studied by

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Huygen

Bragg

Max Planck

None of above

The inert gasses AR, Ka, and Xe form solid compounds with certain organic molecules under pressure..

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Halides

Hydrates

Clathrates

All of above

The capacity of normal human eye to see the smallest object is _______ micro meter

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10000

1000

100

10

Vet days are generally applied to the fabric in the form of.

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Mordants

Leuco base

Oxidised base

Dispersed dyes.

Which of the following steps are involved in the extraction of copper.

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Roasting

Smelting

Refining

All

Retarded reaction are those

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In which the rate of the reaction is independent of pressure

In which products are strongly adsorbed on the surface of the solid catalyst

Which are reversible under all conditions

For which G is positive

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

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