Question
Match column A and column B and choose the right code :
| Column A | Column B |
| 1. $Cr _2 O _{7( aq )}^{2-} \longrightarrow Cr _{( aq )}^{+3}$ | (a) Reduction |
| 2. $2 Br _{2(l)} \longrightarrow 4 Br _{( aq )}^{-}$ | (b) Oxidation |
| 3. $CuSO _4$ | (c) Reduction |
| 4. $Na _2 S_2 O _3$ | (d) Reducing agent |