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COMEDK20269 May 2026Morning ShiftChemistryd and f Block ElementsActual

K ₂ Cr ₂ O ₇ on heating with aqueous NaOH gives -------------------------

Options

  1. ACrO ₄²⁻
  2. BCr(OH) ₃
  3. CCrO ₃
  4. DCr(OH) ₂

Correct answer

A. CrO ₄²⁻

Step-by-step solution

When potassium dichromate ( K ₂ Cr ₂ O ₇ ) is treated with an alkali like aqueous NaOH, the orange dichromate ion is converted to the yellow chromate ion. The balanced chemical equation for the reaction is: Cr ₂ O ₇²⁻ + 2 OH ^- 2 CrO ₄²⁻ + H ₂ O Thus, the product formed is CrO ₄²⁻ . Answer: CrO ₄²⁻

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