Question # 1

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

Nylon, 6,6 is a condensation polymer of

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adipic acid and glycol

phthalic acid and glycol

adipic acid and hexaethylene diamine

phthalic acid and hexaethylene diamine

The motion imparted to the gas molecules by gravity is

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very small

very large

negligible

appreciable

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

An amine is produced in the following reaction
C2H5l+2NH3-------C2H5NH2 +NH4l. What is mechanism?

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Which of the following gases shows more ideal behaviour at 0°C

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H₂

CH₄

He

NH₃

Equal volume of all gases at same temperature and pressure contain number of molecules

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different

multiples

equal

in fractions

The total number of 3d-series transition elements is

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10

40

14

58

Natural fertilizers are materials derived form:

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plants

animals only

both plant and animals

none of all

Polarity of a molecule is expressed in terms of

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Bond strength

Dipole moment

Bond length

Shape

Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil

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diffusion

convection

electrophoresis

chromatography

Heat absorbed or released during the chemical reaction of physical process at constant pressure is equal to

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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

Chromyl chloride and toluene react to produce

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p-chlorotoluene

Benzaldehyde

Benzyl chloride

Bezoic acid

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

Ethyl bromide is formed by the reaction of HBr with

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Ethane

Ethene

Ethyne

Propane

Tripple bond is present in

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O₂

H₂

N₂

Cl₂

Elements have the tendency to attain 8 electrons in their valence shell. This is known as

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Octer rule

Hunds rule

Pauli exclusion principle

Auf ban principle

Organic compounds are soluble in all except

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Benzene

Petroleum

Ether

Water

Lead accumulator stops discharging current when

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Lead at anode converted to PbO₂

PbO₂at cathode converted to Pb

Both electrodes are completely covered with PbSO₄

Both electrodes are completely covered with Pb(OH)₂

The human body can synthesize ______ amino acids

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1

10

20

19

Isotopes of an element differ in

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Number of protons

Number of electrons

Number of neutrons

Number of electrons and protons

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