Chapter 4, Problem 2A

Interpretation Introduction

Interpretation:

The two major types of binary compounds are to be written.

Concept introduction:

A binary compound is the compound having two components.

Examples of binary compound:

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

Answer to Problem 2A

The two major types of binary compounds are:

• Compound in which a metal forms ionic bond with a non-metal.
• Compound in which a non-metal forms bond with a non-metal.

Explanation of Solution

To name binary compounds of various types, some rules are assigned:

Rules for naming ionic compounds:

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

Rules for the naming of compounds of non-metallic elements:

1. It is name by writing the name of first element as same as element.
2. Second element in anionic form and prefixes are used to denote the number of atoms. Prefix mono is not used for first element.

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

Conclusion

Thus, binary compounds are classified into various types on the basis of the components it is composed of.