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JEE Main20264 April 2026Morning ShiftChemistryd and f Block ElementsActual

Correct statements from the following are A. Potassium dichromate is an oxidising agent and it oxidises FeSO₄ to Fe₂(SO₄)₃ in acidic medium. B. Sodium dichromate can be used as primary standard in volumetric estimation. C. CrO₄²⁻ and Cr₂O₇²⁻ are interconvertible in aqueous solution by varying the pH of the solution. D. Cr - O - Cr bond angle in Cr₂O₇²⁻ is 126^ . Choose the correct answer from the options given below:

Options

  1. AA, B and C Only
  2. BA, C and D Only
  3. CA and C Only
  4. DB and D Only

Correct answer

B. A, C and D Only

Step-by-step solution

Statement A is correct. Potassium dichromate acts as a strong oxidising agent in acidic medium and oxidises Fe²⁺ to Fe³⁺ , converting FeSO₄ to Fe₂(SO₄)₃ . 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 ( CrO₄²⁻ ) and dichromate ( Cr₂O₇²⁻ ) ions are interconvertible in a

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