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_2O_3`
`Na_2Cr_2O_7` and `Cr_2O_3`
`K_2Cr_2O_7` and `CrO_3`
`(NH_4)_(2)CrO_(4)` and `CrO_(3)`

Solution :`UNDERSET("ORANGE SOLID")((NH_4)_(2)Cr_2O_7) + underset("Colourlessgas")(N_2) + Cr_2O_3 + 4H_2O`


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