Question 1 :
What is the smallest part of the crystal that has the three-dimensional pattern of the whole lattice called?

Question 4 :
Compounds with identical crystal structure and analogous chemical formula are called:

Question 8 :
Which of the following compounds would be a white, crystalline solid?

Question 9 :
$I$. Metallic solids tend to be very brittle.$II$. Metallic bonds are broken quite easily.

Question 13 :
The nature of bonds in compounds of C and Si is:

Question 17 :
Solid $X$ is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it?

Question 20 :
Some of the following properties are important in determining whether an element has metallic properties.<br/>I : atomic number<br/>II : atomic weight<br/>III: number of valence electrons<br/>IV: number of vacant atomic orbitals<br/>V: total number of electronic shells in the atom<br/>Select correct properties from the codes given below:

Question 23 :
Which of the solids show the following properties?<br>(i) Electrical conductivity<br>(ii) Malleability<br>(iii) Ductility<br>(iv) Fairly high melting point<br>

Question 25 :
Statement: The melting point of all substances decreases with pressure increase.<br/><br/>State whether the given statement is true or false.

Question 27 :
In a cubic structure of compounds which is made from $X$ and $Y$, where $X$ atoms are at the corners of the cube and $Y$ at the face centres of the cube. The molecular formula of the compound is

Question 28 :
<b>Statement-I: &#160;</b>Initially the term pseudo solid was given for solids&#160;which were easily distorted by bending and&#160;compressing forces. They even tend to flow slowly&#160;under its own weight and lose shape.<br/><b>Statement-II:</b> &#160;These characteristics are shown by pseudo solids as in pitch, glass and thus, the name pseudo solid was replaced by supercooled liquids.<br/>

Question 29 :
Assertion: Crystalline solids can cause X-rays to diffract. Reason: Interatomic distance in crystalline solids is of the order of $0.1$ nm.

Question 35 :
Which of the following compounds represents an inverse $2 : 3$ spinel structure?