Among the following oxyacids the correct decreasing order of acid strength is -A HClO4 > HClO3 > HClO2 > HOCl B HCl2 > HClO4 > HClO3 > HOCl C HOCl > HClO2 > HClO3 > HClO4 D HClO4 > HOCl > HClO2 > HClO3

The correct decreasing order of acid strength among the given oxyacids is option A: HClO4 > HClO3 > HClO2 > HOCl.

Here's why:

Acid strength is determined by the stability of the conjugate base after the acid has donated its proton. The more stable the conjugate base, the stronger the acid.

In the case of oxyacids, the conjugate base's stability is increased by the presence of electronegative oxygen atoms, which can help to disperse the negative charge.

HClO4, perchloric acid, is the strongest because it has the most oxygen atoms (4). This means that the negative charge on the conjugate base (ClO4-) is dispersed over a larger number of highly electronegative atoms, making it the most stable.

HClO3, chloric acid, is next with 3 oxygen atoms. HClO2, chlorous acid, follows with 2 oxygen atoms. Finally, HOCl, hypochlorous acid, is the weakest with only 1 oxygen atom.

So, the correct order is HClO4 > HClO3 > HClO2 > HOCl.

The correct decreasing order of acid strength among the given oxyacids is option A: HClO4 > HClO3 > HClO2 > HOCl.

Here's why:

Acid strength is determined by the stability of the conjugate base after the acid donates a proton. The more stable the conjugate base, the stronger the acid.

In the case of oxyacids, the conjugate base's stability is increased by the presence of electronegative oxygen atoms, which can help to disperse the negative charge.

Furthermore, the more oxygen atoms there are, the more the negative charge is dispersed, and the more stable the conjugate base becomes. This makes the original acid stronger.

Therefore, HClO4 is the strongest acid because it has the most oxygen atoms, and HOCl is the weakest because it has the least.