1.

Identify C

Answer»

`Na_(2)Cr_(2)O_(7)`
`Na_(2)CrO_(4)`
`Na_(2)MnO_(4)`
`NaMnO_(4)`

Solution :`UNDERSET(solution)underset(Green)(CrCI_(3)) + 3NH_(4)OH rarr underset("Greensih ppt")(Cr(OH)_(3)DARR)+3NH_(4)CI`
`Na_(2)O_(2) +H_(2)O rarr 2NaOH +[O] xx 3`
`2Cr(OH)_(3) +NaOH +3[O] rarr 2Na_(2)CrO_(4) +5H_(2)O`
`ulbar(2Cr(OH)_(3)+3Na_(2)O_(2)rarrunderset("Yellow solution")(2Na_(2)CrO_(4))+2NaOH+2H_(2)O)`
`underset(Yellow)(2CrO_(4)^(2-))+2H^(o+)rarrunderset("ORANGE")(2CrO_(7)^(2-))+H_(2)O`
`Cr_(2)O_(7)^(2-) +2OH^(Theta) +2Pb^(2+) rarr underset(("BRIGHT yellow ppt"))(2PbCrO_(4)+H_(2)O)`


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