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Chlorides of Phosphorus

A mixture upo...

Question

A mixture upon adding conc. $H_{2} {S O}_{4}$ gives orange red fumes. It may contain the anion pair of :

{C r O}_{4}^{2 -} + {C l}^{-}

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{B r}^{-} + {C l}^{-}

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{N O}_{3}^{-} + {C l}^{-}

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{C r O}_{4}^{2 -} + {N O}_{3}^{-}

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Solution

The correct option is A ${C r O}_{4}^{2 -} + {C l}^{-}$
When a chloride salt mixed with $K_{2} C r_{2} O_{7}$ is heated with conc. $H_{2} S O_{4}$ , under the given condition orange-red vapours are evolved and the anions are ${C r O}_{4}^{2 -} + {C l}^{-}$ .

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Similar questions

c o n c . H_{2} S O_{4}

C l O^{-} + C r (O H)_{4}^{-} \to C r O_{4}^{2 -} + C l^{-}

0.1 M

{C l}^{-}

0.001 M

C r O_{4}^{2 -}

A g {N O}_{3}

A g C l

{A g}_{2} C r O_{4}

K_{s p} A g C l = 1.7 \times 10^{- 10} M^{2}

K_{s p} {A g}_{2} C r O_{4} = 1.79 \times 10^{- 12} M^{3}

{C l}^{-}

C r O_{4}^{2 -}

C r (O H)_{3} + C l O^{-} + O H^{-} \to C r O_{4}^{2 -} + C l^{-} + H_{2} O

H {N O}_{3}

H_{2} {S O}_{4}

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