JEE Main 2025 — Redox Reactions Question with Solution
JEE Main 2025 (3 Apr Shift 2)
Question
Compounds that should not be used as primary standards in titrimetric analysis are :
A.
B. Oxalic acid
C. NaOH
D.
E. Sodium tetraborate
Choose the most appropriate answer from the options given below:
A.
B. Oxalic acid
C. NaOH
D.
E. Sodium tetraborate
Choose the most appropriate answer from the options given below:
Choose an option
Show full solutionCorrect option: D
Correct answer
DA, C and D Only
Step-by-step 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.
is unstable and can be easily oxidised.
is hygroscopic and can't be used.
NaOH is hygroscopic and can't be used.
is unstable and can be easily oxidised.
is hygroscopic and can't be used.
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This is a previous-year question from JEE Main 2025, covering the Redox Reactions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.