Which of the following naming rules is correctly applied when writing names for binary covalent compounds formed between two non metals?

Introduction / Context:
This question deals with the naming of binary covalent compounds in inorganic chemistry. These compounds consist of two different non metals, such as nitrogen and oxygen in nitrogen dioxide or carbon and oxygen in carbon monoxide. Correct application of naming rules, including suffixes and numerical prefixes, is important for clear communication and is frequently tested in examinations.

Given Data / Assumptions:

• The focus is on covalent compounds formed between two non metals.
• Options describe different combinations of names, suffixes, and possible prefixes.
• We assume standard IUPAC style naming rules at basic school level.

Concept / Approach:
For binary covalent compounds between non metals, the name of the first element is written in full, and the second element is written with the suffix ide. Numerical prefixes such as mono, di, tri, tetra, and so on can be used to indicate the number of atoms of each element, especially when there is ambiguity. For example, CO is carbon monoxide and CO2 is carbon dioxide. The correct rule must reflect that both elements are non metals and that the second element ends in ide with possible use of prefixes.

Step-by-Step Solution:

Verification / Alternative check:
Chemistry textbooks list simple examples such as nitrogen monoxide (NO), nitrogen dioxide (NO2), sulfur dioxide (SO2), sulfur trioxide (SO3), and dinitrogen pentoxide (N2O5). All follow the pattern where the first non metal name appears unchanged and the second adopts the ide ending along with prefixes. There is no use of the suffix ite in these standard binary covalent names. Therefore, the description given in option A is consistent with actual examples.

Why Other Options Are Wrong:

• Option B: The suffix ite is generally used in naming oxyanions and related salts, not in simple binary covalent compounds.
• Option C: This pattern is typical for ionic compounds with a metal and non metal, not for two non metals.
• Option D: Again mixes metal plus non metal and uses the suffix ite, which does not match covalent naming rules.
• Option E: It is incorrect because both elements must be named; ignoring the first element would make the name incomplete.

Common Pitfalls:
Students sometimes transfer rules from ionic naming directly to covalent compounds or confuse suffixes such as ate and ite with ide. Another frequent error is forgetting to use numerical prefixes, especially for the second element, which can cause ambiguity. Practising examples and remembering that ide is used for the second non metal element in binary covalent compounds helps avoid these issues.

Final Answer:
The correct naming rule for binary covalent compounds is nonmetal name plus nonmetal name with suffix ide, often using numerical prefixes such as mono, di, or tri.