Question

Which of the following statements is not true? 

(a) on passing H₂S, through acidified K₂Cr₂O₇ solution, a milky colour is observed. 

(b) Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis 

(c) K₂Cr₂O₇ solution in acidic medium is orange in colour 

(d) K₂Cr₂O₇ solution becomes yellow on increasing the pH beyond 7

Answer 1

(b) Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis

Answer 2

(b) Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.

Reason: Na2Cr2O7 is deliquescent and so it is not used as primary standard in volumetric analysis