JEE Main 2026 — Redox Reactions Question with Solution
JEE Main 2026 (05 April Shift 1)
Question
Given below are two statements:
Statement I: Sodium dichromate and potassium dichromate are classified as primary standards in titrimetric analysis.
Statement II: Phenolphthalein is a weak base, therefore it dissociates in acidic medium.
In the light of the above statements, choose the correct answer from the options given below
Statement I: Sodium dichromate and potassium dichromate are classified as primary standards in titrimetric analysis.
Statement II: Phenolphthalein is a weak base, therefore it dissociates in acidic medium.
In the light of the above statements, choose the correct answer from the options given below
Choose an option
Show full solutionCorrect option: B
Correct answer
BBoth Statement I and Statement II are false
Step-by-step explanation
Statement I is false because sodium dichromate is deliquescent (absorbs moisture from the atmosphere) and cannot be weighed accurately, so it is not used as a primary standard. Potassium dichromate, however, is a primary standard.
Statement II is false because phenolphthalein is a weak organic acid, not a weak base. It remains largely undissociated in an acidic medium (colorless) and dissociates in a basic medium to give a pink color.
Therefore, both Statement I and Statement II are false.
Answer: Both Statement I and Statement II are false
Statement II is false because phenolphthalein is a weak organic acid, not a weak base. It remains largely undissociated in an acidic medium (colorless) and dissociates in a basic medium to give a pink color.
Therefore, both Statement I and Statement II are false.
Answer: Both Statement I and Statement II are false
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This is a previous-year question from JEE Main 2026, 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.