Question

name 5 cpds in which bismuth forms cpds in +5 oxidation state

on heating ammonium dichromate and barium azide what we will get

Answer 1

+3 oxidation state is the most common oxidation state shown by Bismuth. Some compounds in which Bismuth shows +5 oxidation are :

• Bismuth(V) fluoride - BiF₅
• Bismuth(V) oxide - Bi₂O₅ - This is unstable red solid
• Sodium bismuthate - NaBiO₃

On heating ammonium dichromate and barium azide separately, following products are obtained:
$$\begin{gathered} \left(N{H}_4{)}_{2}C{r}_2{O}_7\right(s)\stackrel{∆}{\to }C{r}_2{O}_3(s)+N_2(g)+4H_{2}O(g) \\ Ammonium\mathrm{chromium(III)} \\ dichromateoxide \\ Ba(N_3{)}_2\left(s\right)\stackrel{∆}{\to }Ba\left(s\right)+3N_2\left(g\right) \\ Barium \\ azide \end{gathered}$$