Which of the following anions may be identified by their ppt. reaction in aqueous solution ?

C r O_{4}^{2 -}

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S O_{4}^{2 -}

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P O_{4}^{3 -}

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M n O_{4}^{-}

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Solution

The correct options are
A $C r O_{4}^{2 -}$
B $S O_{4}^{2 -}$
C $P O_{4}^{3 -}$
The following anions may be identified by their ppt. reaction in aqueous solution. As follows:
$A : C r O_{4}^{2 -}$
$P b C r O_{4} + (C H_{3} C O O)_{2} P b \to P b C r O_{4}$ ( yellow ppt) $+ 2 C H_{3} C O O N a$
$B : S O_{4}^{2 -}$
$N a_{2} S O_{4} + B a C l_{2} \to B a S O_{4}$ (ppt) $+ 2 N a C l$
$(C H_{3} C O O)_{2} P b + N a_{2} S O_{4} \to P b S O_{4}$ (white) $+ 2 C H_{3} C O O N a$
$C : P O_{4}^{2 -}$
$2 B a_{3} (P O_{4})^{2 -} + 6 H N O_{3} \to 3 B a (N O_{3})_{2} + 2 H_{3} P O_{4}$
$H_{3} P O_{4} + 21 (N H_{4})_{2} . M o O_{4} + 21 H N O_{3} \to (N H_{4})_{3} P O_{4} .12 M o O_{4}$ ( canary yellow ppt) $+ 12 H_{2} O + 21 N H_{4} N O_{3}$ .

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