Which one of the following is used to remove most of plutonium from spent nuclear fuel?

Which is the best reducing agent?

Which of the following is the correct order of thermal stability of hydrogen halides $(H - X)$?

$MnO_{2} + HCl \xrightarrow{\Delta} A_{(g)}$
$A_{(g)} + F_{2} (\text{excess}) \rightarrow B_{(g)}$
$B_{(l)} + U_{(s)} \rightarrow C_{(g)} + D_{(g)}$
The gases $A$,$B$,$C$ and $D$ are respectively

In the manufacture of bromine from sea water,the mother liquor containing bromides is treated with:

Which of the following statements is true?