Question # 1

Diamond is a bad conductor of electricity because:

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it has a tight structure

it has a high density

there are no free electrons

none of the above

Amount of fresh water used by agriculture is

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2%

23%

69%

97%

Zn has

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Zero unpaired electrons

Three unpaired electrons

Five unpaired electrons

One paired electrons

The attractive forces which exist between ionic compounds and water molecules are

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dipole-dipole forces

ion diopole forces

istantaneous dipole-induced dipole forces

dipole-induced dipole forces

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is reactive chemically

Plastics are pollution problem because many plastics:

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are made from petroleum

are very inflammable

burn to produce toxic fumes

decompose to produce toxic products

London dispersion forces are also called

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Ion-dipole forces

Dipole-induced dipole forces

Dipole-dipole forces

Instantaneous dipole induced dipole forces

Carbohydrate that cannot be digested by human digestive system is

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Cellulose

Glycogen

Starch

All of these

Ethene C₂H₄and N₂gases diffuse at the same rate at room temperature. it is due to the reason

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these are non polar gases

their molecular masses are same

both are covalent molecules

both have multiple bonds

Which of the following factors does not affect the SN1 rate is

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Nucleophilicity of the attacking nucleophile

Stability of the carbonium ion

Solvent system

The nature of leaving group

When light is exposed to transtion element, then electrons jump from lower orbitals to higher orbitals in

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Orbitals of s-subshell

Orbitals of d-subshell

Orbitals of p-subshell

between different shells

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

Which of the following reacts with chloroform and base to form phenyl isocynaide?

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Nitrobenzene

Phenol

Chlorobenzene

Aniline

The nature of interparticle forces in benzene is

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Dipole-dipole interaction

Dispersion force

Ion-dipole interaction

H-bonding

Between CH₃COOH and HCOOH, HCOOH will be

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Less acidic

Equally acidic

More acidic

None

The temp. and pressure used for PVC polymerization is

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10°C and 10 atm

20°C and 20 atm

52°C and 9 atm

100°C and 10 atm

Terylene is madeby polymerization of terephthalic acid with

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Ethylene glycol

Phenol

Ethanol

Catechol

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Cane sugar is not soluble in benzene but soluble in water because

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Cane sugar is a macro molecule

Cane sugar is an ionic compound

Can sugar has hydrogen bonding

Can sugar is an organic molecule

Aspirin is

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Acetyl salicylic acid

Phenyl salicylic acid

Salicylic acid

Benzoic acid

Almost forward reaction is complete when value of k_{c :}

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Neither larger nor very small.

Very small.

Very large.

Negligible.

Heat,. work and internal energy of the system and surroundings are related into an equation which is called

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First law of thermodynamics

Hess's law

Henry's law

Born-haber cycle

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