Chemistry Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.

Find out the odd incorrect pair :

Find out the odd incorrect pair :

Find the odd correct pair :

Find the odd correct pair :

Find the odd correct pair :

Find the odd correct pair :

Find the odd one out :

Find the odd one out :

Find the odd one out :

Find the odd one out :

Find the odd one out :

Assertion (A): Schottky defect does not change the stoichiometry of the crystal.
Reason (R): This defect arises due to the missing of equal number of cations and anions from the crystal lattice.

Assertion (A): In bcc, the available volume is more efficiently used than in simple cubic packing.
Reason (R): In simple cubic arrangement, the number of spheres belongs to a unit cell is equal to one whereas in bcc, it is equal to 2.

Assertion (A): Solid ice, Glucose are generally soft solids under room temperature.
Reason (R): The constituents are held together by strong electrostatic forces of attraction.

Assertion (A): Diamond and Silicon carbide are very hard and have high melting point.
Reason (R): In covalent solids, the atoms are bound together in a three dimensional network entirely by covalent bonds.

Assertion (A): Ionic solids do not conduct electricity in solid state but in molten state they conduct electricity.
Reason (R): In solid state, the ions are fixed in their lattice positions but in molten state, the ions are free to move and conduct electricity.

Assertion (A): Crystalline solids are anisotropic in nature.
Reason (R): Anisotropy is the property which depends on the direction of measurement. Crystalline solids are anisotropic and they show different values of physical properties when measured along different directions.

Assertion (A): Amorphous solids are isotropic in nature.
Reason (R): In amorphous solids, they have identical values of physical properties such as refractive index, electrical conductance in all directions which is called isotropy.

Match the following :

List - I	List - II
A. Schottky defect	1. AgBr
B. Frenkel defect	2. FeO
C. Metal excess defect	3. NaCI
D. Metal deficiency defect	4. Zno

Match the following :

List - I	List - II
A. Atomic solid	1. Naphthalene
B. Molecular crystal	2. KCl
C. Covalent crystal	3. Frozen elements of group 18
D. Ionic crystal	4. Diamond

Which one of the following shows non- stoichiometric defect?

Which one of the following is the metal deficiency defect?

Metal excess defect is possible in ………..

Which one of the following is an example for Frenkel defect?

Which one of the following is an example for schoriky defect?

Which one of the following is the packing efficiency in fcc unit cell?

Which one of the following is the coordination number of NaCl?

The coordination number of CSCI ¡s ………..

The coordination number of zinc sulphide is ………..

Which is the coordination number in both hep and ccp arrangements?

The packing fraction in bcc arrangement is ………..

Which is the packing fraction in simple cubic unit cell?

Which one of the following formula is used to calculate the density of the unit cell ?

Which one of the following is known as Bragg’s equation’?

An atom present at the body centre be longs to only unit cell ………..

The atoms the face centre is being shared by ………..

The number of atoms in fee unit cell is ………..

The number of atoms belongs to fcc unit cell is ………..

Which is the coordination number of each atom in a simple cubic unit cell?

Each atom in the comer of the cubic unit cell is shared by how many unit cells?

Consider the following statements.
(i) metallic solids possess high electrical and thermal conductivity
(ii) solid ice are soft solids under room temperature
(iii) In non polar molecular solids constituent molecules are held together by strong electrostatic forces of attraction
Which of the above statements is / are not correct?

Solids ice, glucose are examples of ………..