1.

Solution of a salt in dilute H_(2)SO_(4) or acetic acid produces deep blue colour with starch iodide solution.The salt contains:

Answer»

`Br^(-)`
`I^(-)`
`NO_(3)^(-)`
`NO_(2)^(-)`

Solution :NITRITE ion liberates `I_(2)` from potassium iodide TURNING starch blue.
`2NO_(2)^(-)+3l^(-)+4CH_(3)COOH to I_(3)^(-)+2NOuarr+4CH_(3)COO^(-)+2H_(2)O`
`I_(2)`+starch `to` blue colour


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