Question

Water transported through lead pipes become poisonous due to formation of
1) Pb(OH)2
2) PbO2
3) PbO
4) Pb3O4

Answer 1

water+lead→LEAD HYDROXIDE
H₂O+Pb→Pb(OH)₂

Answer 2

Answer: Option (1) is the correct answer.

Explanation:

It is known that usually lead does not react with water under normal conditions. But when lead comes in contact with moist air then an oxide layer develops on the metal surface.

And, when both oxygen and water are present then the chemical reaction with lead is as follows.

            $2Pb(s) + O_{2}(g) + 2H_{2}O(l) \rightarrow 2Pb(OH)_{2}(s)$

Therefore, lead(II) hydroxide is formed which is toxic in nature.

Thus, we can conclude that water transported through lead pipes become poisonous due to formation of $Pb(OH)_{2}$.