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The orange solid on heating gives a colo...

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

A

`(NH_4)_2 Cr_2O_7 and Cr_2O_3`

B

`Na_2Cr_2O_7 and Cr_2O_3`

C

`K_2Cr_2O_7 and CrO_3`

D

`(NH_4)_2 Cr_2O_4 and CrO_3`

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The correct Answer is:
A
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