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(B) The orange solid is ammonium dichromate, $(NH_{4})_{2}Cr_{2}O_{7}$.Upon heating, it undergoes thermal decomposition to produce nitrogen gas (colou

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$(NH_{4})_{2}Cr_{2}O_{7}$ and $Cr_{2}O_{3}$

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(B) The orange solid is ammonium dichromate, $(NH_{4})_{2}Cr_{2}O_{7}$.Upon heating, it undergoes thermal decomposition to produce nitrogen gas (colourless), chromium$(III)$ oxide (green solid), and water vapor:$(NH_{4})_{2}Cr_{2}O_{7} \xrightarrow{\Delta} N_{2} \uparrow + Cr_{2}O_{3} + 4H_{2}O$The green solid, $Cr_{2}O_{3}$, can be reduced to metallic chromium by aluminium powder in a thermite reaction:$Cr_{2}O_{3} + 2Al \longrightarrow 2Cr + Al_{2}O_{3}$

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

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