Question # 1

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

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2,1,0

2,1,1

3,1,1

3,2,1

Plastics are pollution problem because many plastics:

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Are made from petroleleum

Are very inflammable

Burn to produce toxic funes

Decompose to produce toxic products

Which of the following has highest first ionization potential?

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Carbon

Oxygen

Nitrogen

Boron

Without proper suction filtration is

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Rapid process.

Fague process.

Slow process.

Useless process.

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

At present the number of cement factories is Pakistan are

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20

22

25

30

Most common oxidation states shownby cerium are

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+2, +4

+3, +4

+3, +5

+2, +3

One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having flouring trapped in it

Use a sorbent having Al₂O₃trapped in it

Select from the following the one which alcohol

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99.2%

99.5%

90.5%

96.2%

The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called

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Isomerization

polymerization

Hybridization

Resonance

All C - H bond lengths of benzene ring is

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1.07A°

1.09A°

1.08A°

None

The acid present in vinegar is

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CH₃COOH

HCI

H₂SO₄

HCOOH

A nucleophilic reagent will readily Attack

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Ethylene

Ethanal

Ethanol

Ethylamine

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1

2

3

4

In the chemical combination of hydrogen and fluorine to form HF:

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Sodium atom donates major share of its electrons.

Hydrogen atom donates the major share of its electrons.

Both the atoms share the electrons equally.

None of above.

Group l-A elements react with water fastly than the reaction of group ll-A elements because

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l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

A fat or oil is characterised for extent of unsaturation by one of the following number, which one

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Rancidity number

Acid number

Iodine number

Saponicfication number

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

Benzene does not undergo

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

B-B'-dichloroethyl sulphide is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

Which of the following has magnesium?

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Carbonic anhydrase

Haemocyanin

chlorophyll

Vitamin B₁₂

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

Terylen fibre is made by reaction of terephthalic acid with

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Ethylene

Ethylene glycol

Glycol

Terylene

The conductivity of strong electrolyte

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Increases on dilution slightly

Does not change on dilution

Decreases on dilution

Depends on density of electrolyte it self

Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through molten electrolyte containing aluminium ion is

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30 s

10 s

30,000 s

10,000 s

Which of the following reaction is characteristic of benzene

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Electrophilic substitution reaction

Reduction

Oxidation

Ozonolysis

A polymer may be

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Homopolemer

Co-polymer

Terpolymer

All of these

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

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Two

Three

Four

None

Hydrocarbons are organic compounds which contain elements such as

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Hydrogen

Carbon

Hydrogen and carbon

Halogens

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