Question

Which of the species kclo2, nh4br, hno2, pbs is/are insoluble in water? 1. nh4br and nh3 2. kclo3 3. hno2 4. all of these 5. pbs?

Answer 1

Among the species KClO2, NH4Br, HNO2, and PbS, lead(II) sulfide (PbS) is insoluble in water.

Step-by-step explanation:

The question asks which of the species KClO2, NH4Br, HNO2, and PbS is insoluble in water. According to solubility rules:

• Most nitrates are soluble, so HNO2 would be soluble.
• Most compounds with potassium (K+) are soluble, so KClO2 would be soluble.
• Salts with the ammonium ion (NH4+) are also typically soluble, which means NH4Br would be soluble.
• Lead(II) sulfide (PbS), however, is one of the few sulfides that are insoluble in water.

Therefore, of the given options, PbS (lead(II) sulfide) is insoluble in water.

Answer 2

• PbS are not soluble in water.

Solubility rule: "Like dissolve like"

Reason of insolubility of PbS.

• When sulphides are attached with group one and group two elements of periodic table, they are soluble but when they are attached with transition metals like Pb, there is highly covalent bond which makes difficult dissociation of bonds in water.

• KClO2 and NH4Br are inoic substances , so they are easily soluble. HNO2 is weak acid which can ionize in water.