Question

The valency of carbon is four and that of oxygen is two . From this we understand that there are ___________ chemical bonds/bonds between the carbon atom and one oxygen atom in the compound carbon dioxide.
A.1
B.2
C.3
D.4
                      

Answer 1

Hint: Firstly we need to know the reasons of their respective valencies which will further make it easy to know the reason and the number of bonds formed in it.

Complete step by step answer:
Firstly we will discuss that due to what reason is the valency of carbon four. As we know that its valency is four that means it must have four electrons in the outermost shell . as we know that the main focus of every element is to complete the octet. Now as the carbon has four electrons in the outermost shell then in order to complete the octet it must need four more electrons so finally this octet gets completed when carbon forms the bond with the other atoms and this is further possible by sharing of electrons.
When we further talk about the oxygen then we come to know that its atomic number is eight. Further after getting distributed it has two electrons deficiency in the outermost shell in order to complete the octet.
Now we will discuss the chemical bonds between carbon and oxygen when the formation of carbon dioxide takes place. When we talk about the bond between the carbon and oxygen when the bond is formed then we need to know that carbon and oxygen gets joined leading to the formation of two chemical bonds in it .
Hence, option B is correct which states that there are two chemical bonds present.

Note:
A polar covalent bond exists when atoms with different electronegativities share electrons in a covalent bond.The unequal sharing of the bonding pair results in a partial negative charge on the chlorine atom and a partial positive charge on the hydrogen atom.