Question # 1

According to recent view which is the correct representation of hydrated proton in aqueous solutions.

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H+

H9O3+

H9O4+

H2O+

Each of the following compound is an aromatic except.

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Benzene

Naphthalene

Cyclopentadienyl cation

Cyclopentadienyl anion

__________ are the extensions of bucky balls.

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Goodesic domes

Hexagons

Carbon nanotubes

AFM and STM

Which of the following is the correct order of interactions.

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Covalent < hydrogen bonding < Van Der Waal's < dipole -dipole

Van der Waal's < hydrogen bonding < dipole -dipole < covalent

Van der Waal's < dipole -dipole < hydrogen bonding < covalent

Dipole-dipole < Van der Waal's < hydrogen bonding < covalent

Which type of the solids are generally good conductors of electricty.

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Covalent

Ionic

Metallic

Molecular

Most commercial glasses consist of

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Lime

Soda

Silica

All

Phenol on reaction with ethanoic anhydrides in the presence of sodium ethanoate gives.

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Phenyl benzoate

Ethyl benzoate

Phenyl ethanoate

Phenyl methyl ether

Colour in transition metal compounds in attributed to

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Small sized metal ions

Absorption of light in UV region

Complete ns sub shell

incomplete (n-1) sub shell

Oxalic acid when heated withe conc. H2SO4 it gives out.

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H2O and CO2

CO and CO2

CO2 and H2S

Oxalic sulphate

Hydrogen bond is not electrostatic in nature is stated by

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Electrostatic approach

Valence bond approach

Molecular orbital approach

None of the abvoe

Which of the following extractant is used to solid phase extraction

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Bonding of C18 chains on silica

Bonding of C20 on paper

Bonding of C18 on glass

Bonding of C20 on cellulose

Which of the following to non -auditory effect of noise on human body.

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Changes in the Vascular tone

_{Increase in the blood pressure}

Wakening of the coloured vision

All above

Rutherford proposed the nuclear model of the atom to account for the result of experiments in which the alpha particles are scattered from metal foils.Which of the following statements in not related to Rutherford observation.

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An atom consists of central core or nucleus around which the protons exist.

The nucleus has most of the mass of the atom

the nucleus consists of protons and neutrons.

Each distinct atom has a specific number of protons.

H2SO4 is manufactured by

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The lead chamber process

The contact process

Both A and B

The Ostwald's process

The temperature of which the compound melts into a liquid to the same composition as the solid is called the

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Congruent melting point

Incongruent melting point

Peritectic temperatures

Metastable point

Carbylamine reaction proceeds via the intermediate formation of.

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Alkyl isocyanide

Chloride ion

Alkyl carbonion

Dichloro methylene

Which of the following analytical method is based on scattering of radiation.

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Emission spectroscopy

Colorimetry

Turbidimetry

Polarimetry

How many unpaired electron are there in a strong field iron (II) octahederal compled.

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0

1

2

4

Which of the following compounds combines with hemoglobin.

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CO2

CO

NO

N2

Which of the following health effect is caused by mercury.

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Nerve damage

Brain damage

Kidney damage

All above

Which of the following case of acid or base strength is not explained by inductive effect.

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Formic acid> acetic acid

Dimethyl amine > trimethyl amine

Dimethyl amine > methyl amine

Chloroacetic acid > acetic acid

Which of the following is not an intensive property.

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Melting point

Refractive index

Entropy

Density

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.

Which of the following process always involve the decrease in oxidation number.

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Hydrolysis

Elecomposition

Oxidation

Reduction

Which of the following is not evoked in quantum theory?

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Schrodinger wave equation

The rigid rotor approximation

The particle in a box

Boltzmann distribution

Which of the following steps is involved in quantitative analysis.

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Sampling

Conversion of the desired constituent into a suitable form per analysis.

Measurement of some physical or chemicals property, on which the determination is based.

All above steps

The rays emitted by the cathode in a gas discharge tube under low pressure and high voltage of electricity are called cathode rays. Which of the following properties are not related to cathode rays.

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These travel in a straight lines.

These are deflected by magnetic and electric field.

Minerals Fluoreace with a characteristic color when placed in a beam of cathode rays.

These are dependent of the material used for the electrode.

Group III A of the periodic table consist of elemetns.

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3

4

5

6

Used for sterilizationof drinking water

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F

Br

Cl

I

Each of the following compound react with Grignard's reagent to form alkane exxcept.

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Ethanal

Ethanoic acid

Ethanol

Ethync

Considering the elements F, Cl ,O and N, the correct order of their chemical reactivity in terms of oxidizing property is.

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F > Cl > N

F > O > Cl > N

Cl > F > O > N

O > F > N > Cl

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