Chapter 4, Problem 1A

Interpretation Introduction

Interpretation:

The term binary compound is to be explained by giving examples.

Concept introduction:

Binary compound means compound containing two units.

Answer to Problem 1A

A binary compound is the compound having two components.

Binary compounds are of three types:

• Type-I: Compound in which a metal forms ionic bond with a non-metal and the metal can form only one type of ions.
• Type-II: Compound in which a metal forms ionic bond with a non-metal and the metal can form more than one type of ions.
• Type-III: Compound in which a non-metal forms bond with a non-metal.

Examples of binary compound:

Ammonium chloride, silver sulphide, copper (I) chloride.

Explanation of Solution

Concept introduction:

To name a compound, certain rules are followed.

Rules for naming these compounds:

Type-I:

1. Name of metal cation is written as name of element.
2. Name of anion is written using root name and adding ‘ide’ to it.
3. Writing these names in the same sequence gives the name of compound.

Type-II:

1. Name of metal cation is written as name of element followed by charge carried by it in roman numerals in bracket.
2. Name of anion is written using root name and adding ‘ide’ to it.
3. Writing these names in the same sequence gives the name of compound.

Type-III:

1. The name of the first element is written as given in the periodic table.
2. Second element in anionic form and prefixes are used to denote the number of atoms. Like, prefix mono is not used for 1element.

When metal is bonded with polyatomic ion, rules are similar to ionic binary compounds.

Conclusion

Thus, combination of two components in a compound makes it binary.