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.
$\text{Sn}^{2+} + 2\text{Fe}^{3+} \rightarrow \text{Sn}^{4+} + 2\text{Fe}^{2+}$

Which of the following is the most abundant element in universe?

What is the correct IUPAC name for a molecule that has two amino groups in opposing (para) locations around a benzene ring?