Question

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

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

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Answer

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.

Explanation

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.

Conclusion

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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