Question # 1

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

Which of the following is psuedo solid

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CaF2

Glass

NaCl

All

Ionic solids are characterized by.

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Low melting points

High vapour pressures

Good conductivity in solid state

Solubility in polar solvents

Which has greater enthalpy of vaporization

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F2

Cl2

Br2

I2

Which one of the following substances is not amorphous

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Polymer

Rubber

Glass

AgNO₃

The nature of copper crystals is

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Metallic

Ionic

Covalent

Molecular

Acetone and chloroform are soluble in each other due to.

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Intermolecular hydrogen bonding

Dipole dipole interaction

Instantaneous dipoles

All of the above

Polymorphic substances have

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Same physical and chemical properties

Different physical and chemical properties.

Same physical but different chemical properties

Different physical and same chemical properties.

Allotropy is the property of.

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Compound

Element

Atom

Mixtuer

In triclinic unit cell

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All axial lengths are equal

All internals lengths and angles are equal

Both axial lengths and angles are equal

Both axial lengths and angles are unequal

When water freezes, its volume increase.

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12%

9%

15%

18%

Acetone and chloroform are soluble in each other due to

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Intermolecualr hydrogen bonding

Dipole-dipole interaction

Instantaneous dipoles

All of the above

Which one of the following inter molecular forces are present in neon gas molecules.

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Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

Which is not use of liquid crystals.

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Temperature sensor

Liquid crystal display

Skin thermography

Energy supply in electrical devices.

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

When water freezes at 0°C, its density decreases due to

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Cubic structure of ice

Empty spaces present in the structure of ice

Change of bond lengths

Change of bond angles

London dispersion forces are the only forces present among the

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Molecules of water in liquid state

Atoms of helium in gaseous state at high temperature

Molecules of solid iodine

Molecules of hydrogen chloride gas

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