Question # 1

H₂S is a gas while H₂O is a liquid at room temperature. It is due to:

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Less inter-molecular forces in water.

Covalent bonding H-O in water molecule.

Hydrogen bonding in water molecules

Ionic character in water molecules

Evaporation of water is possible at

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Above 100⁰

0⁰

100⁰

At all temperature

At sea level and at 100⁰C the vapour pressure of water in an open system is

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1000 mm Hg

760 mm Hg

730 mm Hg

670 mm Hg

Evaporation of water is possible at:

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Above 100°C

0°C

100°C

At all temperature

Amorphous solids:

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Have a sharp melting point

Undergo clean cleavage when cut with knife

Have a perfect arrangement of atoms

Can possesses small regions of orderly arrangement of atoms

Ionic Solids are characterized by

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Low melting points

Good conductivity in solid state

High vapour pressure

Solubility in polar solvents

Hydrocarbon molecules with large chain lengths experience

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Weaker attractive forces

Stronger attractive forces

Repulsive forces

No attractive forces

A liquid on evaporation causes

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Heating effect

Cooling effect

Suffication

All of above

Diamond is a bad conductor because

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It has a tight structure

It has a high density

there is no free electron present in the crystal of diamond of conduct electicity

Is transparent to light

Amorphous solids

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Have sharp melting point

Undergo clean cleavage when cut with knife

Have perfect arrangement of atoms

Can possesses small regions of orderly arrangement of atoms

The only forces are London dispersion forces among the

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Atoms of He in gaseous state at high temperature

Molecules of water in liquid state

Molecules of solid I₂

Molecular of hydrochloric acid gas

Escape of high energy molecules from the surface of a liquid is called

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Sublimation

Distillation

Condensation

Evaporation

Chloroform and acetone are soluble in each other due to

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Instantaneous dipole interactions

Dipole-dipole interactions

Intermolecular hydrogen bonding

All of above

The boiling point of NH₃is maximum among the hydrides of group V elements due to

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Enhanced electronegative character of Nitrogen

Pyramidal structure of NH₃

Very small size of Nitrogen

Enhanced electropositive character of Nitrogen

Trend of boiling point of halogens from fluorine to Iodine is that it

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Decreases

Is negligible

Increases

Remains constant

Which of the following liquids has low vapour pressure at 25°C:

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

Rate of evaporation and rate of condensation at equilibrium

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Become very low

Become very high

Become equal

Can never be equal

The molecules of CO_{2 in dry ice from the :}

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Ionic crystals

Coverlet crystals

Molecular crystals

Any type of crystals

Hydrogen bonding is present in one of the following pairs:

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NH₃

H₂O

HF

All of above

Force of attraction between atoms of He is

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London dispersion forces

Hydrogen bondign

Coordinate covalent bond

Covalent bond

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

In a group on going downward, polarizability generally

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Decreases

Increases

Remains constant

Negligible

Hydrogen bonding is present between the molecules of

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NH₃

H₂O

HF

All of above

London dispersion forces are also called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

The intermolecular forces in liquids are

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Negligible

Very weak

Very strong

Reasonably strong

Escape of high energy molecules from the surface of liquid is called:

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Sublimation.

Distillation.

Condensation.

Evaporation.

HF has exceptionally low acidic strengths due to

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Smaller size of fluorine

Strong polar bond between H and F

Electronegativity of fluorine

Strong hydrogen bonding

Diamond is a bad conductor because:

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Ithas tight structure

It has a high density

There is no free electron present in the crystal of diamond of conduct electricity is transparent to light

Debye forces are present in on of the following pairs:

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Na+ion and water

Argon and water

Argon and Na+ion

Ne and water

At sea level and at 100°C the vapor pressure of water in an open system is:

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1000 mm Hg

760 mm Hg

730 mm Hg

670 mm Hg

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