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:
Select the correct option:
A
B and D Only
B
C, D and E Only
C
A, C and D Only
D
D and E Only
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
The primary standard is a highly pure stable compound with a known exact composition that can be accurately weighed and dissolved to create 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 and can be easily oxidized.
$\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is hygroscopic and can't be used.
Hello 👋 Welcome to Competishun – India’s most trusted platform for JEE & NEET preparation. Need help with JEE / NEET courses, fees, batches, test series or free study material? Chat with us now 👇
