Which compound contains both covalent and ionic bonds kcl nh4cl mgcl2 ccl4

Explanation:

Before solving, let us understand the meaning of covalent and ionic bonds and how to identify them.

Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.

By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals. The exception is a compound made with ammonium (NH4+)  Since ammonium is an ion, it forms ionic compounds.

So, now that we have got the basics covered, let us have a look at the options and apply what we just learnt;

A) KCl : K is a metal (belongs to group 1) and Cl is a non metal (group 7). The bond between them would be an ionic bond.

B) NH4Cl : NH4CL contains both an iconic and covalent bond. NH4Cl is made up of ammonium (NH4+) and Chlorine ion. The ammonium ion is polyatomic, which means it forms ionic salts. Therefore whatever bonds it makes are ionic. That said however, the bond between N and H is covalent because both N and H are non-metals. So NH4Cl contains both covalent and ionic bonds.

C) MgCl : Mg is a metal (belongs to group 2) and Cl is a non metal (group 7). The bond between them would be an ionic bond.

D) CCl4 : Since Carbon and Clhorine are non metals, the bond between them is a covalent bond.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.