1.

Ifacidifiedsolution of K_(2)Cr_(2)O_(7)turmgreenon additionof a saltthree saltmay contain Fe^(2+).

Answer»


Solution :`6Fe^(2+) + Cr_(3)O_(7)^(2-) + 14H^(oplus) rarr 6Fe^(oplus) + underset((Green))(2Cr^(3+)) + 7H_(2)O`
`Cr_(2)O_(3)^(2+)//H^(oplus)` can oxidise `Fe^(2+)` in `Fe^(2+)` giving greencolouration at the and point


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