Binary Compounds

Binary Compounds

What are Binary Compounds?

Binary compounds are chemical compounds comprising of two distinct elements. An element is a substance that cannot be further divided into any simpler substances using chemical methods. Hence sodium fluoride, magnesium oxide, and calcium chloride are all chemical elements. So it implies that binary compounds comprise of exactly two different chemical elements.

Examples of Binary Compounds: There are binary compounds which consist of more than one of each element. For example water, it comprises of two hydrogen atoms and one oxygen atom (H2O). Water and calcium chloride are also examples of binary compounds that one can see in their daily life.

Binary Acids

It is a group of binary compounds of hydrogen which includes a hydrogen atom attached to another atom which is in the 7th group of the periodic table. These elements include astatine,  fluorine, chlorine, iodine, and bromide. Other elements such as arsenic, sulfur, polonium, selenium and tellurium can also be considered.

The strength of binary acids depends on various factors namely electronegativity, bond strength and dissociation constant. Binary acids are much stronger than other types of acids.

The designated convention is: “Hydro-” + Nonmetal + “-ic” + “acid”

Example: Hydrochloric Acid (HCl).

Difference between Binary Acids  and Binary Compounds

One of that factor that differentiates binary acids from binary compounds is when we consider its physical state. Acids are assigned the symbol ‘aq’ in aqueous molecules as acids are also present in aqueous solution. Symbol ‘l’ and ‘g’ stands for liquid or gas in a molecule than it is a binary compound.

Binary Ionic Compound

Binary ionic compounds are salts which consist of only 2 elements. Here both elements are ions ( an anion which has a negative charge and a cation which has a positive charge). The binary compound list is mentioned in the table below.

Binary Ionic Compound List

Potassium fluoride
Copper (II) chloride
Lead (II) bromide
Lead (II) iodide
Copper (II) sulfide
Calcium sulfide
Lead (II) iodide
Iron (II) bromide
Sodium oxide
Lead (II) bromide
Sodium sulfide
Aluminum fluoride
Magnesium chloride
Aluminum chloride
Magnesium nitride
Sodium phosphide

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Practise This Question

Match the following:

(i)Can have variable composition of constituent elements(A)Compound(ii)___  is new substance formed due to reaction of two constituent elements(B)Mixture(iii)Constituent elements can be separated easily(C)Element(iv)Can be separated only by chemical or electrochemical reactions(v)Composition is always fixed(vi)Shows properties of constituent elements
The correct pairs are:-