x mol of oxalate ${\mathrm{FeC}}_2{\mathrm{O}}_4\cdot {\mathrm{Fe}}_2{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3.2{\mathrm{H}}_2\mathrm{O}$ on reaction with ${\mathrm{Al}}_2{\left({\mathrm{Cr}}_2{\mathrm{O}}_7\right)}_3$ requires 500 mL 0.4 M of it. Select the correct statement(s)

n-factor of ${\mathrm{Al}}_2{\left({\mathrm{Cr}}_2{\mathrm{O}}_7\right)}_3$ is 6

n-factor of ${\mathrm{Al}}_2{\left({\mathrm{Cr}}_2{\mathrm{O}}_7\right)}_3$ is 1

Moles of oxalate which react with ${\mathrm{Al}}_2{\left({\mathrm{Cr}}_2{\mathrm{O}}_7\right)}_3$ is 0.65

Moles of oxalate which react with ${\mathrm{Al}}_2{\left({\mathrm{Cr}}_2{\mathrm{O}}_7\right)}_3$ is  0.4