1.

The orange solid on heating gives a colourless gas and a green solid which can be reduced to metal by aluminium powder. The orange and the green solids are, respectively

Answer»

`(NH_(4))_(2)Cr_(2)O_(7) and Cr_(2)O_(3)`
`Na_(2)Cr_(2)O_(7) and Cr_(2)O_(3)`
`K_(2)Cr_(2)O_(7) and CrO_(3)`
`(NH_(4))_(2)CrO_(4) and CrO_(3)`

SOLUTION :`underset("Orange solid")((NH_(4))_(2)Cr_(2)O_(7)) overset(Delta)rarr underset("Colouress gas")(N_(2)) + underset("Green solid")(Cr_(2)O_(3))+4H_(2)O`
`Cr_(2)O_(3) + 2Al overset(Delta)rarr 2Cr + Al_(2)O_(3)`


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