Question # 1

Which of the following is a thermosetting plastic?

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PVC

polyethylene

polystyrene

melamines

An organic compound made from oxidation of ethanol is

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Formic acid

Acetic acid

Malonic acid

Citric acid

Elastic collision involves:

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gain of energy

loss of energy

no relationship between elastic

no gain or loss of energy

Which of the following statement about ribose is incorrect

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Poly hydroxyl compound

It is an aldo sugar

Contain six carbon atoms

It exhibit optical activity

Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases?

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NO₂

SO₂

Hg

Pb

Which of the following is an example of diffusion?

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Spreading of smell of flowers in garden

Steam condensing on a cold window

Bubbles rising in a beaker of boiling water

All of above

6Na+ Fe2O3 -------- 3 Na2O+2Fe For above reaction, if you are provided with 230g Na and 320g Fe2O3, then limiting reactant is

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, Na

Na2O

Fe2O3

none of these

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Monosaccharides adn oligosacchardies are generally called as

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Crystal

Sugars

liquids

Non-sugars

If there are weak intermolecular forces in a liquid, it will be

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more volatile

less volatile

more dense

less heavy

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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Sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

Catalytic oxidation of alkanes is used for the preparation of

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Adehydes

Fatty acid

Carbonyylic acids

Ketones

At what pH glycine shows the structure H_3N⁺-- CH₂-- COOH

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2

7

10

14

The standard enthalpy change in the formation of 1 mole of a compound from its elements in their standard physical states is

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Enthalpy of formation

Enthalpy of atomization

Enthalpy of neutralization

Internal energy change

At present the number of fertilizers plants in Pakistan are

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10

12

14

20

Shape of CIO₃is

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Triangular pyramidal

Tetrahedral

Triangular planar

Triangular bipyramidal

Mercury is the only metal which is liquid at 0°C. this is due to its

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Very high ionization energy and weak metallic bond

Low ionization potential

High atomic weight

High vapour pressure

Which of the following is a method of converting a unsaturated ketone into unsaturated hydrocarbon?

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Aldol condensation

Reimer Tiemann reaction

Cannizaaor's reaction

Wolf-kishner reduction

The reaction of an alkyl halide with RCOOAg produces

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Ester

Ether

Aldehyde

Ketone

The specific conductance of 0.1 M NaCl solution is 1.06 x 10^-2ohm^-1mol^-1. Its molar conductance in ohm^-1cm²mol^-1is

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1.06 x 10²

1.06 x 10³

1.06 x 10⁴

53

Atoms can be evident by use of electron microscope, field ionization microscope and:

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x-rays

Video camera

Telescope

Compound microscope

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