Question # 1

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

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NO

NO2

N2O

All above

A molecule returns from the excited singlet state to the ground singlet state with emission of light This process is known as

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Fluorescene

Scattering

Phosphorescence

Chemiluminescence

What is the purpose of molybdenum in steel alloying.

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To increase dynamic and high temperature strength and hardness

To increase brittleness

To increase corrosion and resistance

All above

When the concentration of reactant molecules is increased the rate of reaction increases. The best explanation is As the reactant concentration increases.

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The average kinetic energy of molecules increases.

The frequency of molecular collisions increases

The rate constant increase

The activation energy increases

The Ostwald process is the main method for the manufacture of nitric Acid in the fist step in this process is.

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Nitrogen and hydrogen react to form NH3

Ammonia is burned in O2 to generate N2 and H2O

Nitrogen and oxygen react to form NO2

Ammonia is burned with O2 to generate NO and H2O

Which of the following halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

The terpenoid responsible fo the smell

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Camphor

Genenial

Citral

Carvone

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

Which of the following range is correct for macro analysis.

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Minimum 100 mg

Minimum 10 mg

Minimum 1 mg

Minimum 1000 mg

Four elements A, B,C,D have atomic numbers Z , 1 ,Z, Z +1 and Z +2 Respectively If Z is 9, then bond between which pair of elements will be ionic.

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A and C

D and C

D and B

B and C

IUPAC name of HCONH2 is.

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Methanamide

Methanoylamine

Ammoethanal

Formanide

In confining and growing nano roade CNTs will act as.

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Template

Support

Source of oxidant

Sieve

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

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

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

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

An element having low IE and low EA is likely to belong to.

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Group IA

Group IB

Group VII A

Group VIII

SO2 is generated from which of the following industry.

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Drying and packing

Paper

Pulp

paper and pulp

In the electronic structure of acetic acid,the total number of shared and unshaped pair of electrons are respectively.

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16 ,8

8 ,4

12 ,8

8 ,12

Which of the following statement is not correct regarding the stern theory of charge on colloidal particles.

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The colloidal particle has a charge distribution at its surface.

In the immediate vicinity of the colloidal particles there is an excess of counter ions

The greater the concentration and charge of ions in the diffused electrical double layer. the larger is the thickness of the layer

At large distance from the colloidal particles, the concentration of co-ions and counter ions are almost equal

For highly paraffine , crude oil, the characterization factor will be in range of

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11.5-12.5

12.5-13.0

13.5-14.0

13.4-15.0

A theoretical link between quantum mechanics and thermodynamic is.

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Electrochemistry

Kinetic theory of gases

Spectroscopic analysis

Statistical thermodynamics

The maximum number of electrons in first energy levels are.

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1

2

8

10

An acid base titration involves a neutralization reaction in which an acid is reacted with an equivalent amount of base The titrant is always a strong acid or base The analyte may be

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Strong acid

Strong base

Weak acid and Weak base

All above

The IUPAC name of C2H3, CO , OC OC2H5 in

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Prepanoic anhydride

Ethanoic anhydride

Diketoethoxy ether

None of the above

In Pakistan how many units are involved to the production of glass.

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20

25

30

None of these

Which of the following statement is not related with direct use of solar energy.

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It is used for space heating of buildings

It can be used to produce electrical power using photovoltaic cells

It can be used to produce hydrogen gas

It can be used start motor vehicle

Which of the following pentahalides is not formed.

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NF5

PF5

AsF5

BiF5

Most Hazardous metal pollutant of automobile exhaust is.

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Tin

Mercury

Cadmium

Lead

_______ is heat treatment cycle that prevents glass from harmful stress.

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Forming

Annealing

Batching

None of these

Two solids A and B have appreciable different solubility in water but their m.p. are very close. The mixture A and B can be separated by.

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Sublimation

Distillation

Fractional crystallization

Specific rotation

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