Question

Which of the following substances are likely to be soluble in water?

A) ZnS
B) Au2(CO3)3
C) PbCl2
D) MnO2

Answer 1

All the given substances are insoluble in water

Step-by-step explanation:

According to solubility rule-

(1) All sulfides are insoluble except alkali and alkaline earth metals.

So, ZnS is insoluble in water.

(2) All carbonates are insoluble except
`NH_(4)^(+)` and alkali metals.

So,
`Au_(2)(CO_(3))_(3)` is insoluble in water.

(3) All chlorides are soluble except AgCl,
`Hg_(2)Cl_(2)` and
`PbCl_(2)`

So,
`PbCl_(2)` is insoluble in water.

(4) All metallic oxides are insoluble except
`NH_(4)^(+)` and alkali metals.

So,
`MnO_(2)` is insoluble in water.

Answer 2

Based on the solubility rules for the given set of compounds

All lead salts (Pb2+), carbonates (CO3^2-), oxides (O^2-) and sulfides (S^2-) are insoluble in water, whereas all chlorides (Cl-) salts are soluble in water.

A) ZnS - Insoluble

B) Au2(CO3)3 - Insoluble

C) PbCl2 - Soluble

D) MnO2 - Insoluble

Ans) A ) PbCl2