Question 3 :
The nature of bonds in compounds of C and Si is:
Question 7 :
Compounds with identical crystal structure and analogous chemical formula are called:
Question 9 :
$I$. Metallic solids tend to be very brittle.$II$. Metallic bonds are broken quite easily.
Question 14 :
Which of the following compounds would be a white, crystalline solid?
Question 15 :
What is the smallest part of the crystal that has the three-dimensional pattern of the whole lattice called?
Question 17 :
If we know the ionic radius ratio in a crystal of ionic solid, what can be known of the following?
Question 19 :
A solid melts slightly above $273$ K and is a poor conductor of heat and electricity. To which of the following categories does it belong?
Question 21 :
At very low temperature, oxygen $(O_{2})$ freezes and forms a crystalline solid. Which term best describes the solid?
Question 25 :
Which of the following is not an example of molecular crystal?<br/>
Question 26 :
Which of the following moleculeshas polar bonds but is a nonpolarmolecule?<br>
Question 28 :
Which of the following statement is not correct about molecular crystals?
Question 32 :
Which of the following exists as covalent crystals in the solid state?
Question 34 :
Assertion: $SiC$ has higher melting point that $NaCl$.
Reason: $SiC$ has stronger electronic forces of attraction.
Question 39 :
Statement: Diamond glitters because of its high refractive index.<br/><br/>State whether the given statement is true or false
Question 41 :
Examples of few solids are given below. Find out the example which is not correctly matched.
Question 44 :
Which of the following is an examples of covalent crystal solid?
Question 45 :
Which of the following exists as covalent crystals in the solid state?<br/>
Question 50 :
Statement: Covalent solids are good conductor of electricity.<br/>State whether the given statement is true or false
Question 51 :
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 58 :
The thermal conductivity of silver and copper is high because they have following binding :<br/>
Question 59 :
Which of the following is an example of metallic crystal solid?
Question 61 :
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 62 :
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 63 :
Which type of bonding is responsible for the ability of some solid materials to conduct electricity?
Question 64 :
Statement: The melting point of all substances decreases with pressure increase.<br/><br/>State whether the given statement is true or false.