Complete and balance the following compound $A l B r_{3} + K_{2} C r_{2} O_{7} + H_{3} P O_{4} \to K_{3} P O_{4} + A l P O_{4} +$ $+$ _.

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Solution

$K_{2} C r_{2} O_{7}$ is strong oxidising agent in acidic medium.It oxidises $B r^{-}$ to $B r_{2}$ and itself reduced to $C r^{+ 3}$ .
$6 {A l B r}_{3} + {3 K}_{2} {C r}_{2} O_{7} + 14 H_{3} P O_{4} \to K_{3} P O_{4} + 6 {A l P O}_{4} + 6 C r {P O}_{4} + 9 {B r}_{2} + 21 H_{2} O$

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