What is plumbosolvency,the dissolution of lead in?

Write two reactions to explain the amphoteric nature of water.

Which relation is incorrect?

Explain the importance of water for living organisms.

When chlorine water is exposed to sunlight,$O_2$ is liberated. Hence

Given below are two statements: One is labelled as Assertion $A$ and the other labelled as Reason $R$.
Assertion $A$: During the boiling of water having temporary hardness,$Mg(HCO_3)_2$ is converted to $MgCO_3$.
Reason $R$: The solubility product of $Mg(OH)_2$ is greater than that of $MgCO_3$.
In the light of the above statements,choose the most appropriate answer from the options given below.