What is the solubility product of binary sparingly soluble salt BA if 100 mL saturated solution of salt consist $10^{-4}$ moles at room temperature?

Calculate pOH of 0.001M HCl solution.

Identify from following the conjugate base of $[\text{Zn}(\text{H}_2\text{O})_4]^{2+}$

For the following redox reaction, find the correct statement.
$\text{Sn}^{2+} + 2\text{Fe}^{3+} \rightarrow \text{Sn}^{4+} + 2\text{Fe}^{2+}$