Question # 1

In which of the following molecules strongest hydrogen bond is shown

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water

ammonia

hydrogen fluoride

hydrogen sulphide

Which element is expected to show the greatest tendency to form some covalent compounds?

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aluminium

calcium

magnesium

sodium

How many secondary carbon atoms are present in Methylcylopropand

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1

2

3

0

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

The most abundant protein in the human body is

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Collagen

Keratin

Myosin

Albumin

A semiconductor of Ge can be made p-type by adding

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Trivalent impurity

Tetravalent

Pentavalent impurity

Divalent impurity

How many fertilizer plants are now in Pakistan?

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20

14

12

10

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

Which of these polymers is an addition polymer?

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nylon 6,6

Polystyrene

terylene

epoxy resin

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

Essential alpha-amino acids are those which are necessary in the diet.

Which one is an essential alpha-amino acids

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Alanine

Aspartic acid

Glycine

Tryptophan

Alkyl halides in which a halogen atom is bonded to that carbon atom which directly bonded with one hydrogen atom is called

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

Quaternary alkyl halides

Which of the following reactions occur at moderate rate :

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Rusting of iron

Chemical weathering of stone work of buildings by acidic gases in atmosphere.

Hydrolysis of an ester

Fermentation of sugars

German silver does not contain

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Cu

Zn

Ni

Mn

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 posses linear geometry

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Alkane

Alkene

Alkyne

Benzene

The reaction-method that does not give an alkane is

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Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halide

The reference calomel electrode is made from which of the following?

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ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

The order of reactivity of halogen acids for reaction with C₂H₅OH is

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HCl > HBr > HI

HI > HBr > HCl

HBr > HI > HCl

HBr > HCl > HI

Primary alcohols and aldehydes are oxidized to corresponding:

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alkanes

alkenes

Alkynes

Carboxylic Acid

Tertiary alkyl halides are practically inert to substitution by S_N2 mechanism because of

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Onsolubility

Instability

Inductive effect

Steric hindrance

Alkali metals react violently with halogens to form

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Hydrides

Halides

Anyhydrides

None of these

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