JEE Main 2026 — d and f Block Elements Question with Solution
JEE Main 2026 (04 April Shift 1)
Question
Correct statements from the following are
A. Potassium dichromate is an oxidising agent and it oxidises to in acidic medium.
B. Sodium dichromate can be used as primary standard in volumetric estimation.
C. and are interconvertible in aqueous solution by varying the of the solution.
D. -- bond angle in is .
Choose the correct answer from the options given below:
A. Potassium dichromate is an oxidising agent and it oxidises to in acidic medium.
B. Sodium dichromate can be used as primary standard in volumetric estimation.
C. and are interconvertible in aqueous solution by varying the of the solution.
D. -- bond angle in is .
Choose the correct answer from the options given below:
Choose an option
Show full solutionCorrect option: B
Correct answer
BA, C and D Only
Step-by-step explanation
Statement A is correct. Potassium dichromate acts as a strong oxidising agent in acidic medium and oxidises to , converting to .
Statement B is incorrect. Sodium dichromate is deliquescent (absorbs moisture from the atmosphere), which prevents it from being weighed accurately. Therefore, it cannot be used as a primary standard in volumetric estimation. Potassium dichromate is used instead.
Statement C is correct. Chromate () and dichromate () ions are interconvertible in aqueous solution depending on the of the solution. In acidic medium, chromate changes to dichromate, and in basic medium, dichromate changes to chromate: .
Statement D is correct. The structure of the dichromate ion consists of two tetrahedral groups joined by a bridging oxygen atom, and the bond angle is .
Therefore, statements A, C, and D are correct.
Answer: A, C and D Only
Statement B is incorrect. Sodium dichromate is deliquescent (absorbs moisture from the atmosphere), which prevents it from being weighed accurately. Therefore, it cannot be used as a primary standard in volumetric estimation. Potassium dichromate is used instead.
Statement C is correct. Chromate () and dichromate () ions are interconvertible in aqueous solution depending on the of the solution. In acidic medium, chromate changes to dichromate, and in basic medium, dichromate changes to chromate: .
Statement D is correct. The structure of the dichromate ion consists of two tetrahedral groups joined by a bridging oxygen atom, and the bond angle is .
Therefore, statements A, C, and D are correct.
Answer: A, C and D Only
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This is a previous-year question from JEE Main 2026, covering the d and f Block Elements 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.