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.

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)