$\mathrm{IO}_3^{-} ~\&~ \mathrm{IO}_3^{-}$

$\mathrm{I}_2 ~\&~ \mathrm{I}_2$

$\mathrm{I}_2 ~\&~ \mathrm{IO}_3^{-}$

$\mathrm{IO}_3^{-} ~\&~ \mathrm{I}_2$

$\begin{array}{lll}\text { (i) } \mathrm{Br}_2, \mathrm{Fe} & \text { (ii) } \mathrm{Fe}, \mathrm{H}^{+} & \text {(iii) } \mathrm{LiAIH}_4\end{array}$

$\begin{array}{lll}\text { (i) } \mathrm{Br}_2(\mathrm{aq}) & \text { (ii) } \mathrm{LiAIH}_4 & \text { (iii) } \mathrm{H}_3 \mathrm{O}^{+}\end{array}$

(i) $\mathrm{Fe}, \mathrm{H}^{+}$   (ii) $\mathrm{Br}_2$ (aq)   (iii) $\mathrm{HNO}_2$   (iv) $\mathrm{H}_3 \mathrm{PO}_2$

(i) $\mathrm{Fe}, \mathrm{H}^{+}$   (ii) $\mathrm{Br}_2(\mathrm{aq})$   (iii) $\mathrm{HNO}_2$   (iv) $\mathrm{CuBr}$

A-III, B-I, C-IV, D-II

A-II, B-I, C-III, D-IV

A-IV, B-I, C-III, D-II

A-III, B-IV, C-I, D-II

50

32

72

16