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On passing ${\mathrm{H}}_2\mathrm{S}$ through acidified ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution, a milky colour is observed

${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is preferred over ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ in volumetric analysis

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution in acidic medium is orange

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution becomes yellow on increasing the $\mathrm{pH}$ beyond 7