Compounds that should not be... | JEE Main 2025 | Equivalent

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JEE MAIN 2025

03-04-2025 S2

Question

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.

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