Question # 1

Halogens form halogen acids. HF is the weakest among all of them This is due to the reason that

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fluorine is a very small-sized atom

fluorine is highly electronegative atom

there is strong hydrogen bonding in HF

the polarity of HF bond is less

The nature of the attractive force in acetone and chloroform are

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dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

instantaneous forces

Polarizability is responsible for intermolecular forces and it

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increases down the group

decreases down the group

almost remains the same

increased along a period

Dipole-dipole interaction are present in the

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atoms of the He gas

molecules of CCl4

molecules of solid iodine

molecules of :NH3

H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:

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water is more polar than HF

water has a bent structure

HF has a zig zag structure after making hydrogen bonding

the number of hydrogen bonds produced by water are greater than that of HF

The boiling point of higher alkanes are greater than those of lower alkanes due to reason that

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higher alkanes have greater number of atoms

the polarizabilities of higher alkanes are greater

higher alkanes have greater hydrogen bonding

higher alkanes have zig-zag structures

The boiling of water may be 120°C, when the external pressure is

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greater than 760 torr

less than 760 torr

equal to 760 torr

variable

lce occupies more space than liquid water

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9%

10%

11%

12%

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

H-bonding is maximum in:

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ethanol

benzene

diethyl ether

water

Liquids evaporate at every temperature. When the temperature becomes constant for a liquid, then:

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rate of evaporation is greater than the rate of condensation

the rate of condensation is greater than the rate of evaporation

The rate of condensation and evaporation become equal

it depends upon the nature of the liquid

Hydrogen bonding is extensively present in proteins which form the spiral. The hydrogen bond being produced is between

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nitrogen and hydrogen atom

oxygen and hydrogen atom

carbon and hydrogen atom

oxygen and carbon atom

The boiling points of the halogens

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increases down the group

decreases down the group

remains constant

can not be predicted

Dipole-induced dipole forces are also called

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dipole-dipole forces

ion-dipole forces

Debye forces

London-dispersion forces

Strong dipole-dipole forces among the liquid molecules are responsible for

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very high heat of vaporization

very low heat of vaporization

cannot be predicted

negligible forces are these

Hydrogen bonding is not present in which of following compound?

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Ammonia

Ethanol

Ether

Water

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

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