JEE Mains · Chemistry · STD 11 - 8.3. Organic chemistry purification and characterization
Compounds that should not be used as primary standards in titrimetric analysis are _______.
A. \(\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7\)
B. Oxalic acid
C. NaOH
D. \(\mathrm{FeSO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}\)
E. Sodium tetraborate
Choose the most appropriate answer from the options given below:
- A B and D Only
- B D and E Only
- C C, D and E Only
- D A, C and D Only
Answer & Solution
Correct Answer
(D) A, C and D Only
Step-by-step Solution
Detailed explanation
The primary standard is a highly pure stable compound with a known exact composition that can be accurately weighed and dissolved to creat a solution of known concentration. NaOH is hygroscopic and can't be used. \(\mathrm{FeSO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}\) is unstable…
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