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Solution


Q.

Compounds that should not be used as primary standards in titrimetric analysis are:             [2025]

A. Na2Cr2O7

B. Oxalic acid

C. NaOH

D. FeSO4·6H2O

E. Sodium tetraborate

Choose the most appropriate answer from the options given below:
1 B and D Only  
2 D and E Only  
3 C, D and E Only  
4 A, C and D Only  

Ans.

(4)