Question # 1

Which of the following element has six electrons in the valance shell but cannot exhibit a maximum co valency of six.

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Sulpher

Oxygen

Salenium

Both A and B

When of the following steps is involved in structure determination of an organic compound.

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Purification of compund.

Qualitative and quantitative analysis of elements present

Determination of molar mass

All above steps

The splitting of H2O can be carried out through

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Photolysis

Electrolysis

Dialysis

Hydrogenation

The ration of thermal conductivity of silver to that of a carbon nanotube is.

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100 : 1

1 :100

10:1

1:10

According to the Debye-Huckel theory of strong electrolytes, and ion moving in an atmosphere of oppositely charged ions experience a drag This effect is known as

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Aaymmetric effect

Electrophoretic effect

Inter ionic effect

Concentration effect

Which of the following statement is related with CO.

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It is a colorless and tasteless gas

It has less affinity to words hemoglobin

It has a boiling point of -192 ^oC

It is a dangerous asphyxiant

Which element out of the following can ehibit a maximum con valency of seven.

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Chlorine

Sulphur

Fluorine

both Cl and F

Group VA of the periodic table consist of elements.

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3

4

5

6

Which of the following is a natural polymer

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Nylon

Leucite

Cellulose

Polystyrene

Argon is used in filling of.

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Discharge tubes

Luminous tube

Fluorescent tubes

None of above

Which of the following is not correct criteria for an idea solution.

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Enthalpyh of mixing = 0

Volume of mixing = 0

Free energy of mixing = 0

Obeys Reoult's law

The expected specific waste fo petroleum industry is.

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Asphalt and tars

Paper

Cloth

Fibre

Granulated sugar also known as.

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Brown sugar

Refined sugar

White sugar

None of these

Oxytocin, a pituitary hormone to

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Amino acid

Polypeptide

Protein

Conjugated protein

When a strong beam of light is passed through a colloidal solution, the light will

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Be reflected

Be scattered

Pass unchanged

Be dispersed

The rate of a chemical reaction is proportional to the product of the active mean of the reactants, This is a statement of.

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Law of dynamic equilibrium

Le Chatlier's principle

Law of mass action

Solubility product principle

Which of the following elements has the highest density.

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Mg

Na

K

Rb

The correct increasing order of bond dissociation energy for N2, O2, F2 and Cl2 is

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N2 < O2 < F2 < Cl2

F2 < Cl2 < O2 < N2

F2 < Cl2 < N2 < O2

N2 < Cl2 < F2 < O2

Which of the following species is determined by complex metric titrations.

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K+

Na+

Ca+

Cl-

The movement of an electric charge produce a magnetic field is known from the

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Elementary Physics

Elementary Chemistry

Both A and B

None of above

In terms of number of phases (p) components (C) and degree of freedom (F) the phase rule is expressed as.

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P + C = F + 2

F = P+ C - 2

P + F= C + 2

P - F = C = 2

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

The hybridization of sulphur in sulphur dioxide is.

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sp

sp2

sp3

dsp2

Which of the following fuel is used in flame photometry.

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Hydrogen gas

Acetylene gas

Methane

Propane

All above

What is a process of producing a hard surface in a steel having a sufficiently high carbon content to respond to hardening by a rapid cooling of the surface?

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Cyaniding

Nitriding

Flame hardening

Stability

Which of the following molecule does not contain the covalent bond between similar atoms.

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N2H4

F2O2

H2F2

H2O2

Nitric acid is used in manufacturing of.

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Explosive

H2SO4

Fertilizer

All above

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 technique is based on deposition of the analyte at appropriate electrode by the passage of the electric current.

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Chromatography

Dialysis

Electrodeposition

Solvent extraction

The specific gravity of H2SO4 is

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1.37

1.84

1.17

1.57

Classical smog occurs in place of.

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Excess concentration of SO2

Low temperature

High temperature

Excess concentration of ammonia

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