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 boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

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

The B.P of glycerine at 760 torr pressure is

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200°C

290C°

250C°

262C°

lce occupies more space than liquid water

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9%

10%

11%

12%

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

Ice floats on water because

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the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

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

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 point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

Hydrogen bonding is not present in which of following compound?

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Ammonia

Ethanol

Ether

Water

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

The forces which are present between the ions and the water molecules are known as

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dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

London dispersion forces

H-bonding is maximum in:

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ethanol

benzene

diethyl ether

water

The long chains of amino acids are coiled around one another into a spiral by

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ionic bond

Van der Waal's forces

hydrogen bonding

overlapping of orbitals

Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called:

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heat of vaporization

latent heat of fusion

molar heat of fusion

molar heat of sublimation

The boiling points of the halogens

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increases down the group

decreases down the group

remains constant

can not be predicted

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