Question # 1

In order to maintain the boiling point of water at 110 C°, the extemal pressure should be

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550 torr

between 500 and 760 tor

between 760 and 1500 torr

any pressure can be maintained

One of the following can produce greater number of moles of ethyl chloride on reacting with escess of ethanol

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PCI5

PCI3

HCI/ZnCl2

SOCI2

choose the best example of diffusion of gases:

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vapour condensing on moist surface

spreading of small from a scent bottle

hot air rising above a candle

bubbling in soda bottle

Which three element are needed for the health growth of plants:

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S,S,P

N,Ca,P

N,P,K

N,K,C

The maximum hydrogen bonding is in:

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diethyl ether

ethanol

water

benzene

The nature of l₂crystals are

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Metallic

Covalent

Ionic

Molecular

NH₃shows maximum boiling among the hydrides of group V elements. The is due to:

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pyramidal structure of NH₃

H-bonding between its molecules

enhanced electronegative character

very small size of nitrogen

The order of reactivitv of alksI halides towards nucleophile is

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RI>RBr RF>RCI

RF>RCI>RBr>RI

RI>RBr> RCI>RE

RF>RBr>RCI>RI

The B.P of glycerine at 760 torr pressure is

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200°C

290C°

250C°

262C°

Which of these polymer is synthetic polymer

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Animal fat

Starch

Cellulose

Polyester

Cyclonite is a powerful:

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explosive

antiseptic

analgesic

anti-inflammatory

Which of the following will have the highest boiling point?

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Methanal

Ethanal

Propanal

2-Hexanone

Williamson's synthesis is used to prepare

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Diethylether

Phenolphthalein

Hydrogenation

Bakelite

The experimental relationship between a reaction rate and the concentration of reactants is called

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Order or reaction

Rate law

Activated complex

Molecularity

Which one of the following statements is not correct

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A molecule is the smallest particle of an element which can exist independently

He is a molecule of helium

S₈is a molecule of sulphur

O₃is a molecule of oxygen

When alkyl halide is heated with aqueous solution of ammonia at 100°C the major product is

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Primary amine

Secondary amine

Tertiary amine

Mixture of amines and salt

denaturing of alcohol is done by adding methanol in ethanol:

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10%

20%

30%

40%

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

Which of the following derivative cannot be prepared directly from acetic acid?

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Acetamide

Acetyl chloride

Ethyl acetate

Acetic acid

pH and pKa of the buffer are related by Henderson equation which is

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The addition of HCN to carbonyl compounds is an example of

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Nucleopihlic substituion

Electrophilic addition

Nueleophilic addition

Electrophilic substitution

Gypsum is a common mineral of

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Magnesium

Strontium

Calcium

Barium

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