Question # 1

The nature of copper crystals is

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Metallic

Ionic

Covalent

Molecular

How many allotropic forms are present in carbon

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Two

Three

Four

Five

The lightest value of lattice energy is for which one of these ionic compounds.

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NaI

NaF

NaBr

NaCl

The distillation of liquid under reduced pressure is called.

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Destructive distillation

Vaccum distillation

Simple distillation

Fractional distillation

Diamond is bad conductor because.

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It has a tight structure

It has a high density

It is transparent to light

There are o free electros present in the crystal of diamond to conduct electricity.

NH₃shows a maximum boiling point among the hydrides of V-A group elements due to

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Very small size of nitrogen

Lone pair electrons present on Nitrogen

Enhanced electronegative character of Nitrogen

Pyramidla structure of NH₃

The repulsion of electronic clouds of the molecules are responsible for the attractive forces among the molecules. These forces are

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Dipole-induced dipole forces

Ion-dipole forces

Instantaneous dipole-induced dipole forces

Dipole-dipole forces

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.

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

A pressure cooker reduces cooking time because.

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Heat is uniformly distributed

Boiling point of water rises

A large flame is used

Vapour pressure of liquid reduces

Diamond is a bad conductor because.

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It has tight structure.

It has a high density

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

None of the above

The shape of diamond crystal is.

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cubic

Hexagonal

Tetragonal

Orthorhombic

Molecular crystals are generally

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Hard

Relatively soft

Unstable

do not exist

NaCI is face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-unit cells

Only one unit cell

8-unit cells

Existence of an element in more than one crystalline form is known as.

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Anisotropy

Allotropy

Isomorphism

Unit cell

Which of the following is psuedo solid

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CaF2

Glass

NaCl

All

Amorphous solids.

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Have sharp melting points.

Undergo clean cleavage when cut with knife

Have perfect arrangement of atoms

Can possesses small regions of orderly arrangement of atoms.

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