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Potassium Dichromate

One of the ox...

Question

One of the oxoacid salts on heating with $c o n c . H N O_{3}$ and ammonium molybdate, gives yellow ppt. What is this ion?

A

P O_{3}^{3 -}

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B

P O_{4}^{3 -}

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C

S O_{4}^{2 -}

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D

C l^{-}

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Solution

The correct option is C $P O_{4}^{3 -}$
It is $P O_{4}^{3 -}$ (phosphate) ion.

$H_{3} P O_{4} + 21 H N O_{3} + 12 (N H_{4})_{2} M o O_{4} ⟶ (N H_{4})_{3} P O_{4} . 12 M o O_{3} + 21 N H_{4} N O_{3} + 12 H_{2} O$

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