a$)$ Cl$2($aq$)+2$ Br$1($aq$)->2$ Cl$-($aq$)+$ Br$2($aq$)$

b$)$ Cl$2($aq$)+2$ I$1($aq$)->2$ Cl$-($aq$)+$ I$2($aq$)$

c$)$ Br$2($aq$)+2$ Cl$1($aq$)->2$ Br$-($aq$)+$ Cl$2($aq$)$

d$)$ Br$2($aq$)+2$ I$1($aq$)->2$ Br$-($aq$)+$ I$2($aq$)$

e$)$ I$2($aq$)+2$ Cl$1($aq$)->2$ I$-($aq$)+$ Cl$2($aq$)$

f$)$ I$2($aq$)+2$ Br$1($aq$)->2$ I$-($aq$)+$ Br$2($aq$)$

$1.$ in the above six reactions, which diatomic halogen was reduced $($reacted by gaining electrons$)$ twice?

$2.$ In the above six reactions, which diatomic halogen was reduced only once?

$3.$ Which diatomic halogen was not reduced at all?