Question # 1

The polarizabilities of elements mostly increase down the group due to the reason that

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the atomic numbers increase

number of protons increase

number of shells increase along with increase of shielding effect

the behaviour of the elements remain the same

Dipole-induced dipole forces are also called

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dipole-dipole forces

ion-dipole forces

Debye forces

London-dispersion forces

The boiling points of the halogens

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increases down the group

decreases down the group

remains constant

can not be predicted

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

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

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

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

Point out the substance which has maximum vapour pressure at a given temperature?

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Acetone

Water

Ethanol

Acetic acid

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

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

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molecular

metallic

ionic

covalent

Oxygen and sulphur are present in VI-A group of the periodic table The hydride of oxygen i.e., H2O is liquid at room temperature but the hydride of sulphur (H2S) is a gas. This is due to

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greater bond angle of water than Hs

greater bond lengths in HS than H2O

hydrogen bonding in water

acidic character of HS

Which of following factor affect vapour pressure of a liquid?

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temperature

inter molecules forces

size of the molecules

all of these

lce occupies more space than liquid water

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9%

10%

11%

12%

Hydrogen bonding is not present in which of following compound?

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Ammonia

Ethanol

Ether

Water

The weakest intermolecular forces present in a liquid may be

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Dipole-induced dipole forces

dipole-dipole forces

instantaneous forces

electrostatic forces between ions in a ionic solid

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

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

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