5. Bismuthates are strong oxidizing agents: they release chlorine from concentrated hydrochloric acid, convert manganese (2) to manganese (7), and chromium (3) to chromium (6). Write the reaction equations:
a) NaBiO3 HCl(conc) →;
b) NaBiO3 MnSO4 H2SO4→;
c) NaBiO3 Cr2(SO4)3 H2SO4 →.

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