Q: Iodine molecules are held in the crystal lattice by

I2 is a nonpolar molecule and hence, London force.

Question 1

Most crystals show good cleavage because their atoms, ions or molecules are

Accepted Answer

Most crystals show good cleavage because of their atoms, ions, or molecules are arranged in planes, which is due to their flat crystal faces.

Question 2

Which of the following is the only incorrect statement regarding amorphous solids?

Accepted Answer

Amorphous solids are isotropic.

Question 3

A solid melt slightly above  273K and is a poor conductor of heat and electricity. To which of the following categories does it belong?

Accepted Answer

The melting point is very low.

Question 4

A solid is soft, good conductor of electricity and has very high melting point. Its one of the allotropic forms is the hardest known substance. Hence, the solid is an example of

Accepted Answer

Graphite is a covalent solid.

Question 5

Constituent particles in quartz are bonded by

Accepted Answer

Quartz is a covalent solid having network of

Question 6

Ionic solids are characterized by

Accepted Answer

Ionic compounds are normally soluble in polar solvents.

Question 7

Which of the following is an example of metallic crystal solid?

Accepted Answer

AgCl is a crystalline solid. C and Si are covalent solid. Among given options only Tungsten, W is a metallic crystalline solid.

Question 8

Which of the following is an example of covalent crystal solid?

Accepted Answer

SiO2​ has a network of

Question 9

The particles would be stationary in a lattice only at

Accepted Answer

At absolute zero, the particles have no thermal energy.

Question 10

Iodine molecules are held in the crystal lattice by

Accepted Answer

I2​ is a nonpolar molecule and hence, London force.

Question 11

The unit cell of highest symmetry is

Accepted Answer

In a cubic unit cell, all axial distances and all angles are equal.
a = b = c
α=β=γ=90°
Therefore, it is highly symmetrical.

Question 12

The unit cell of lowest symmetry is

Accepted Answer

In a triclinic unit cell, all axial distances and all axial angles are unequal.
a=b=c
α=β=γ=90°
Therefore, it is of the lowest symmetry.

Question 13

A match box exhibits ______ geometry.

Accepted Answer

In a matchbox, the axial distance is
a=b=c and 
the axial angles α=β=γ=90°. 
This is similar to orthorhombic geometry.

Question 14

If the three interaxial angles defining the unit cell are all equal in magnitude, the crystal cannot belong to the ____ system.

Accepted Answer

Hexagonal (α=β=90∘, γ=120∘)

Question 15

In a crystal, the constituent particles are located at the position of

Accepted Answer

In a crystal, the atoms are located at the position of minimum potential energy in order to attain greater stability.

Question 16

A lattice is defined as

Accepted Answer

Every point in the lattice is identical to that of any other point in the lattice.

Question 17

The axial angles in triclinic crystal system are

Accepted Answer

The axial angles in triclinic crystal system are α=β=γ=90∘

Question 18

TiO2​ is a well-known example of

Accepted Answer

TiO2​  has a tetragonal system with five planes of symmetry and five axes of symmetry.

Question 19

In a tetragonal crystal,

Accepted Answer

In a tetragonal crystal, α=β=γ=90∘;a=b=c

Question 20

Which of the following crystalline arrangement will have at least one of the angles equal to 90∘ and at least two axial lengths equal?

Accepted Answer

Among the crystalline arrangements given, only the tetragonal arrangement fits into the condition given.
axial lengths:  a=b=c
Angles:  α=β=γ=90°

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Solutions for Problems and Solutions in Physical Chemistry for JEE (Main and Advanced) by Neeraj Kumar

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