Question

7 which of the following lists the correct name for pcl₅? a phosphorus chloride b monophosphorus pentachloride c phosphorus pentachloride d phosphoric acid

Explanation:

• For naming binary covalent compounds (compounds formed between two non - metals), the first element is named as is, and the second element has its root name followed by the suffix “-ide”.
• Prefixes are used to indicate the number of atoms of each element. The prefix “mono -” is usually omitted for the first element.
• In \(PCl_{5}\), there is 1 phosphorus (\(P\)) atom (no “mono -” prefix for \(P\)) and 5 chlorine (\(Cl\)) atoms. The prefix for 5 is “penta -” and the root of chlorine is “chlor -” with the suffix “-ide”.

Answer:

C. Phosphorus Pentachloride