Which among ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ and ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is more suitable as a primary standard in volumetric analysis?

${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is deliquescent, so cannot be accurately weighedmore suitable as a primary standard in volumetric analysis.

Hence, the correct option is B.