Question

Which of the following is not an ionic compound?
(A) Sodium Hydride
(B) Carborundum
(C) Potassium oxide
(D) Calcium carbide

Answer 1

Ionic compounds are neutral compounds which are made up of positively charged ions called cations and negatively charged ions are known as Anions.

Complete answer:
An ionic compound is a chemical compound composed of ions held together by electrostatic forces known as Ionic bonding. These can be formed from simple ions such as the sodium $\left( {N{a^ + }} \right)$ ions and chloride ions $\left( {C{l^ - }} \right)$ in sodium chloride or polyatomic species such as the ammonium $(N{H_4}^ + )$ and carbonate $\left( {C{O_3}^{2 - }} \right)$ ions in ammonium carbonate.
A) Sodium hydride is an ionic compound. It is made of sodium cations $\left( {N{a^ + }} \right)$ and hydride ions $\left( {{H^ - }} \right)$
The free hydride ions give this molecule its strong basis character.
b) Carborundum (Silicon Carbide) has a chemical formula called ‘Sic’. This compound is formed by a strong covalent bonding.
c) Potassium oxide is an ionic compound formed by combining potassium and oxygen. It carries the chemical formula ${K_2}O.$
d) The bond between the two carbon atoms is covalent However, the bond between calcium and the ${C_2}^{2 - }$ fragment is ionic. Hence we can conclude, calcium carbide can be classified as a compound with ionic nature.
So, all discussions are shown above, it means carborundum is not an ionic compound
So, The correct answer is (B).

Additional Information: Compounds consisting of hydrogen ions $\left( {{H^ + }} \right)$ are classified as acids, and those containing electro-positive cations and basic anions ions such as the hydroxide $\left( {O{H^ - }} \right)$ or oxide $\left( {{O^{2 - }}} \right)$ are classified as bases.Other compounds which are ionic in nature are known as salts and are generally formed by acid-base reactions.
-Acidic salt is a result of a strong acid and weak base. Whereas basic salt is the product when strong base and weak acid react together.

Note:
This term was introduced by English physicist and chemist Michacl Faraday in $1834$ for the then unknown species that goes from one electrode to the other through an aqueous medium.