Q: Which of the following group 14 elements shows maximum tendency towards catenation?

Catenation is the linkage of atoms of the same element into longer chains. Catenation most readily occurs in carbon which forms covalent bonds with other carbon atoms to form longer chains and structure. C with the least diffuse p orbital can form a longer p-p sigma bond. This sigma overlap is strong enough to form stable C-C long chains.

Q: Which of the following is a non-metallic conductor:

Each C atom in hexagonal ring in graphite undergoes sp^2 hybridisation and make 3 sigma bonds with 3 neighbouring carbon atoms. 4th electron forms a \pi bond. These electrons are delocalised over the whole sheet which results in conductivity.

Q: Dry ice is chemically _______.

Dry ice, sometimes referred to as "cardice" (chiefly by British chemists), is the solid form of carbon dioxide. It is used primarily as a cooling agent.

Question 1

Which of the following does not exhibit inert pair effect?

Accepted Answer

Only high atomic weight elements in p block show inert pair effect. Here B is the first member of boron family and it does not have high atomic weight so it does not show inert pair effect.

Question 2

The maxium covalency of aluminium is:

Accepted Answer

The maximum covalency of Aluminium is 6. Since Aluminium belongs to the 3rd period, it possesses a 3d subshell as well. As a cation it can use  sp^{3}d^{2}  hybrid orbitals for a covalency of 6.

Question 3

The tendency to show inert pair effect follows the order :

Accepted Answer

Down the group inert pair effect increases so the correct order is  B < Al < Ga < In < Tl .

Question 4

Which of the following group 14 elements shows maximum tendency towards catenation?

Accepted Answer

Catenation is the linkage of atoms of the same element into longer chains. Catenation most readily occurs in carbon which forms covalent bonds with other carbon atoms to form longer chains and structure. C with the least diffuse p orbital can form a longer p-p sigma bond. This sigma overlap is strong enough to form stable C-C long chains.

Question 5

Which of the following is a non-metallic conductor:

Accepted Answer

Each C atom in hexagonal ring in graphite undergoes  sp^2  hybridisation and make 3 sigma bonds with 3 neighbouring carbon atoms. 4th electron forms a  \pi   bond. These electrons are delocalised over the whole sheet which results in conductivity.

Question 6

Dry ice is chemically _______.

Accepted Answer

Dry ice, sometimes&#10;referred to as &#34;cardice&#34; (chiefly by British chemists), is the solid&#10;form of carbon dioxide. It is used primarily as a cooling agent.

Some P-Block Elements