Question

Both ionic and covalent bonds are present in:
A. $C{{H}_{4}}$
B. $NaOH$
C. $KCl$
D. $S{{O}_{2}}$

Answer 1

An ionic bond is a type of bond which are joined between cations and anions, cations are positive while the anions are negative, and in salts also there are two parts, i.e., positive and negative part.

Complete step by step answer:
There are three types of bonds that are formed between the elements to form a compound, these are ionic, covalent, and coordinate bonds. An ionic bond is formed between a metal and a nonmetal, a covalent bond is formed between two nonmetals, and a coordinate bond is formed when the ligand donates its electron towards the central metal atom.
An ionic bond is a type of bond which is joined between cations and anions, cations are positive while the anions are negative, and in salts also there are two parts, i.e., positive and negative parts. So, according to the IUPAC, salt is, "a chemical compound consisting of an assembly of cations and anions".
Therefore, we can say that all ionic bonds are salts and all salts contain ionic bonds. For example, sodium chloride $NaOH$ is a salt in which the sodium ion is the positive part, i.e., cation and it has one positive charge $\left( N{{a}^{+}} \right)$ and the chloride ion is the negative part, i.e., anion and it has one negative charge $(O{{H}^{-}}).$
Some other examples having ionic bonds are sodium chloride $\left( NaCl \right)$ , sodium bicarbonate $(NaHC{{O}_{3}})$ , magnesium chloride $(MgC{{l}_{2}})$ etc.

So, the correct answer is Option B.

Note: Don't get confused between ionic and coordinate bonds, in $Fe{{(CN)}_{6}}$ you could say that there are ionic bonds, but there is a coordinate bond because the cyanide is the ligand and iron is the central metal ion.