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A colourless inorganic compound (A) impa...

A colourless inorganic compound (A) imparts a green colour to flame. Its solution does not give white precipitate with `H_(2)S`. Its solution gives white precipitate with conc. `H_(2)SO_(4)` which is insoluble in dil. `H_(2)SO_(4)`. When it is heated with `K_(2)Cr_(2)O_(7)` and conc. `H_(2)SO_(4)`, a red gas is evolved. The gas when passed through aqueous NaOH solution turns it Yellow. Identify the compound (A) and give chemical reactions.

Text Solution

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Since `A` gives green colour to the Bunsen flame, (A) is barium compound .
`(A)` gives red gas on heating with `K_(2)Cr_(2)O_(7)` and conc. `H_(2)SO_(4)` `(A)` contains chloride ion.
Hence `(A)` is `BaCl_(2)`
`BaCl_(2)+H_(2)S rarr ("No reaction")`
`BaCl_(2)+H_(2)SO_(4) rarr underset("White ppt")(BaSO_(4)darr)+2HCl`
`BaCl_(2)+K_(2)Cr_(2)O_(7)+3H_(2)SO_(4)rarr K_(2)SO_(4)+underset(Red.)(2CrO_(2)Cl_(2))+2BaSO_(4)+3H_(2)O`
`CrO_(2)Cl_(2)+4NaOH rarr underset("Yellow soln")(Na_(2)CrO_(4))+2NaCl+2H_(2)O` .
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