Question

Amongst the following covalent bonding is found in
A) Sodium chloride
B) Magnesium chloride
C) Water
D) Brass

Answer 1

Hint: Covalent bond is formed due to sharing of electrons among atoms. The element or atom which tries to get the noble gas configuration shares electron pairs and forms covalent bonds. Especially non metals form covalent bonds.

Complete step by step solution:Sodium chloride has the molecular formula of $NaCl$ . Here sodium has one electron and chlorine has seven electrons in its valence shell. Sodium is a metal. So, it removes its electron and chlorine accepts the electron. Thus ionic bonds are formed.
Magnesium chloride has the molecular formula of $MgC{{l}_{2}}$ . Here magnesium has two electrons and chlorine has seven electrons in its valence shell. Magnesium is a metal. So, it removes its electron and chlorine accepts the electron. Thus ionic bonds are formed.
Water has the molecular formula of ${{H}_{2}}O$ . Here oxygen has six valence electrons and hydrogen has one valence electron. Thus they share electrons among themselves and form pure covalent bonds.
Brass is an alloy. It is a mixture of various metals.

Amongst the following covalent bonding is found in water.

Thus the correct option is C.

Note: The covalent bond present in water is polar in nature. Here due to polarity of the bond the oxygen atom gets partial negative charge and the hydrogen atoms get partial positive charge.