1.

The iron salt used in blue prints is :

Answer»

`FeC_(2)O_(4)`
`Fe_(2)(C_(2)O_(4))_(3)`
`K_(4)Fe(CN)_(6)`
`FeSO_(4)`

Solution :`2CrO_(4)^(2-) +2H^(+) to Cr_(2)O_(7)^(2-) +H_(2)O`
`Cr_(2)O_(7)^(2-)+2OH^(-)+2CrO_(7)^(2-)+H_(2)O`


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