Question # 1

Which of the following liquid has highest bolling point

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HCI

HBr

H2O

Br2

Choose an addition polymer among the following:

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terylone

nylon 6,6

polystyrene

epoxy resin

Hess's law is analogous to

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Law of heat summation

law of increasing entropy

Law of heat exchange

Ist law of thermodynamics

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Which process of pulp making is mostly used in Pakistan?

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Kraft process

Sulphite process

Neutral sulphite semi chemical process (NSSC)

All of these

One of the best applications of Hess's law to calculate the lattice energy of ionic compound is

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Measurement of enthalpy change in a calorimeter

Studying of first law of thermodynamics

Measurement of a heat of formation of a compound

Born-Haber cycle

Dehydrogenase is an erample of

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Transferase

Hydrolase

Lyase

Oxido-reductase

Which of the following is correct for epoxy resin

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Coating material for thermal power stations

It give chemical resistance

Epichlorohydrin is monomer

All of these

Keratomalacia is caused due to the d3eficiency of vitamin:

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A

B

K

D

Which one of the following molecules show maximum hydrogen bonding?

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H₂O

H₂Se

H₂S

HF

Saturated hydrocarbons having carbon atoms more than 20 in a molecule are solids due to

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higher densities

higher molar masses

the chain, are more zig-zag

all are correct

Charge of an electron is:

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1.6 x 10^-19 C

9.1 x 10^-34 C

1.7588 x 10¹¹ C

6.62 x 10^-34 C

If we remove one hydrogen atom from an alkane we obtain a group called

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Acetyle group

Formyle group

Alkyle group

Ketyle group

Either, an organic compound has close resemblance in structure and thus a derivative of:

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Water

Oxides of lithium

Oxides of magnisium

Oxides of aluminium

Which of the following is a molecular diseases?

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Allergy

Cancer

German measles

Sickle cell anemia

Macromolecules or polymers are large molecules built up from small molecules called monomers. This hypothesis put forward by

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Schrodixger

Standinger

Lewis

Newton

During a chemical reaction heat may be

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absorbed

Evolved

Both evolved and absorbed

None of these

A solution containing 5.8 grams acetone (CH₃OCH₃), 4.6 gram ethyl alcohol (C₂H₅OH) and 12 grams chloroform (CHl₃) has mole fraction and mole percent of acetone

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0.11, 10%

0.33, 33%

0.22, 22%

0.11, 33%

Major food factors are:

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Fats and oils

Carbohydrates

Proteins

All of these

Content of carbon in steel is:

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0.12 to 0.25%

0.25% to 2.5%

3.0 to 3.5%

4.0 to 4.5%

Which of the following does not reflect the periodicity of elements?

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Bonding behaviour

Electronegativity

Ionisation potential

Neutral/proton ratio

If Grignard reagent is allowed to react with another alkyl halide the main product is

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An alkane

Cyclo alkane

Alkyne

An alkene

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