$K_2Cr_2O_7$ is preferred to $Na_2Cr_2O_7$ for use in volumetric analysis as a primary standard because:
- A$Na_2Cr_2O_7$ is hygroscopic while $K_2Cr_2O_7$ is not.
- B$K_2Cr_2O_7$ is hygroscopic while $Na_2Cr_2O_7$ is not.
- C$K_2Cr_2O_7$ is pure while $Na_2Cr_2O_7$ is impure.
- DNone of these.
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