"Chlorine-type" laundry bleaches are in reality aqueous solutions of:

A. $\mathrm{HOCl}$
B. $\mathrm{HClO}{3}$
C. $\mathrm{NaClO}
D. $\mathrm{NaOCl}$

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To determine what "chlorine-type" laundry bleaches are in reality aqueous solutions of, we need to consider the chemical reactions involved in the bleaching process.


When chlorine ($ \text{Cl}_2 $) reacts with water, the reaction can be represented as follows:

$$ \text{Cl}_2 + \text{H}_2\text{O} \rightarrow \text{HCl} + \text{HOCl} $$

In this reaction:

  • Hydrochloric Acid (HCl)
  • Hypochlorous Acid (HOCl)

The important part here is the formation of Hypochlorous Acid (HOCl). This compound is the active agent responsible for the bleaching action. It bleaches by the process of oxidation.


Hypochlorous Acid (HOCl) is used in the bleaching process due to its oxidizing properties. Therefore, "chlorine-type" laundry bleaches are, in reality, aqueous solutions of Hypochlorous Acid ($\mathrm{HOCl}$).

Hence, the correct answer is:

A. $\mathrm{HOCl}$

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