Cho PTHH:

Câu hỏi: Cho PTHH: ${\mathrm{CrO}}_3$  + NaOH  →   X

A.  ${\mathrm{NaCrO}}_2$, ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$, ${\mathrm{CrCl}}_3$

B. ${\mathrm{Na}}_2{\mathrm{CrO}}_4$, ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$, ${\mathrm{CrCl}}_3$

C. ${\mathrm{Na}}_2{\mathrm{CrO}}_4$, ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$, ${\mathrm{Cl}}_2$

D. ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_3$, ${\mathrm{Na}}_2{\mathrm{CrO}}_4$, ${\mathrm{Cl}}_2$