A) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution in acidic medium is orange
B) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution becomes yellow on increasing the pH beyond 7
C) On passing H2S through acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]solution, a milky color is observed
D) \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\]is preferred over\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]in volumetric analysis
Correct Answer: D
Solution :
\[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\]is deliquescent and therefore not used as primary standard in volumetric analysis.
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