Balance the following oxo acid in order of increasing acid strength: HClO, HClO2, HClO3, HClO4. Name the oxo acid. Why are toothpastes chlorinated?

Here are the answers to your questions:

i) Complete the table below:

Oxoacid	Name	Oxidation State of Chlorine
$\text{HClO}$	Hypochlorous acid	$+1$
$\text{HClO}_2$	Chlorous acid	$+3$
$\text{HClO}_3$	Chloric acid	$+5$
$\text{HClO}_4$	Perchloric acid	$+7$

ii) Explain why a toothpaste contains chlorinated salt instead of common salt (sodium chloride).

Assuming "chlorinated salt" in this context refers to a fluoride salt (e.g., sodium fluoride, $\text{NaF}$, or sodium monofluorophosphate, $\text{Na}_2\text{PO}_3\text{F}$), which is a common active ingredient in toothpaste:

Toothpaste contains fluoride salts because fluoride ions play a crucial role in strengthening tooth enamel and preventing dental cavities. Fluoride ions react with the hydroxyapatite in tooth enamel to form fluorapatite. Fluorapatite is significantly more resistant to acid attack by bacteria in the mouth than hydroxyapatite, thereby protecting teeth from decay. Common salt (sodium chloride, $\text{NaCl}$), while sometimes used as a mild abrasive or flavoring agent, does not provide this specific chemical benefit for strengthening enamel against acid erosion.